Method of screening cell death inhibitor

ABSTRACT

There is provided a method for screening a substance capable of inhibiting cell death induced by the activation of PARP, particularly a substance which is useful as a therapeutic agent and/or a preventive agent for rheumatoid arthritis, neuronal death at the time of cerebral ischemia, cell death of the heart after myocardial infarction reperfusion, autoimmune destruction of β-cells of pancreatic islets of Langerhans, cell death after shock, or inflammatory reaction by immunocyte death. Also provided are a novel protein and a novel gene coding for the same.  
     The aforementioned screening method comprises a step of allowing a substance to be tested to contact with a cell expressing an LTRPC2 protein under such a condition that the LTRPC2 protein can be activated, and a step of analyzing inhibition of the activation of the LTRPC2 protein. The aforementioned novel protein is a rat or mouse LTRPC2 protein, and the aforementioned novel gene is a rat or mouse LTRPC2 gene.

TECHNICAL FIELD

[0001] This invention relates to a method for screening a cell death inhibitor. Also, the present invention relates to novel rat LTRPC2 and mouse LTRPC2.

BACKGROUND OF THE INVENTION

[0002] Poly-ADP-ribose polymerase (PARP) existing in the nucleus is an enzyme which is activated by DNA degradation caused by inducible nitrogen oxide, oxygen radical and the like and thereby effects addition of the ADP ribose moiety of nicotinamide adenine dinucleotide (NAD) to nuclear protein and DNA. That is, a DNA damage activates PARP to cause addition of a large amount of ADP ribose to histone and PARP itself while consuming ATP. It is considered that intracellular NAD and ATP are reduced as the result to cause cell death due to intracellular energy depletion (Zhang, J. and Snyder, S. H., Science, 263, 687-689, 1995). Five genes coding for the PARP protein have so far been reported, and it is considered that the PARP activity is expressed through functioning of these genes. Among these genes, PARP-1 gene is the gene analyzed in most detail and is considered to be a gene having the most high contribution to the cell death accompanied by the activation of PARP protein (Smith, S., Trends Biochem. Sci., 26174-179, 2001).

[0003] It has been reported that NAD depletion by a DNA damage in cells of pancreatic islets of Langerhans does not occur in a PARP gene-deleted mutant mouse (Heller, B. et al., J. Biol. Chem., 270, 11176-11180, 1995). In addition, according to another reference, it has been revealed that the NAD depletion by a DNA damage does not occur also in cerebral cortex neuron in the aforementioned mutant mouse, and it has been reported that the cerebral infarction range accompanied by transient cerebral ischemia is significantly reduced in this mouse (Eliasson, M. J. et al., Nature Med., 3, 1089-1095, 1997). Thus, it is known that the cell death induced by the activation of PARP causes serious diseases in tissues of the living body. Also known as diseases in which the cell death induced by the activation of PARP is concerned include neuronal death at the time of cerebral ischemia, cell death of the heart after myocardial infarction reperfusion, autoimmune destruction of β-cells of pancreatic islets of Langerhans in type I diabetes mellitus, cell death after shock, inflammatory reaction by immunocyte death, and rheumatoid arthritis as an autoimmune disease which onsets by the generation of an abnormality in immune functions (Eliasson, M. J. et al., Nature Med., 3, 1089-1095, 1997; Zingarelli, B., Salzman, A. L. and Szabo, C., Circ. Res., 83, 85-94, 1998; Burkart, V. et al., Nature Med., 5, 314-319, 1999; Pieper, A. A. et al., Proc. Natl. Acad. Sci., 96, 3059-3064, 1997; Szabo, C., Cuzzocrea, S., Zingarelli, B., O' Connor, M. and Saltzman, A. L., J. Clin. Invest., 100, 723-735, 1997; Oliver F. J. et al., EMBO J., 18, 4446-4454, 1999; Szabo, C. et al., Proc. Natl. Acad. Sci., 95, 3867-72, 1998).

[0004] On the other hand, it is known that N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) or H₂O₂ causes cell death by activating PARP (Halappanavar, S. S. et al., J. Biol. Chem., 274, 37097-37104, 1999; Watson, A. J., Askew, J. N. and Benson, R. S., Gastroenterology, 109, 472-482, 1995), and it is known that 3,4-dihydro-5-[4-(1-piperidinyl)butoxy]-1(2H)-isoquinolinone (DPQ), 3-aminobenzamide or nicotinamide inhibits cell death caused by PARP through the inhibition of the activation of PARP (Takahashi, K. et al., Brain Res., 829, 46-54, 1999; Watson, A. J., Askew, J. N. and Benson, R. S., Gastroenterology, 109, 472-482, 1995)).

[0005] However, the presence of a factor existing in the downstream of PARP has not been clarified yet, and it is not clear at present about the cell death-inducing mechanism of the PARP activation.

[0006] On the other hand, a human LTRPC2 (long transient receptor potential channel 2) gene was obtained in 1998 (Genomics, 54, 1, 124-131, 1998). Regarding a mouse LTRPC2 gene, there are reports stating that it was obtained (Japanese Journal of Pharmacology, Suppl. 1, 83, 2000, Molecular Cell, 9, 163-173, 2002), but its actual nucleotide sequence has not been reported. In addition, information on a rat LTRPC2 has not been reported. It has been revealed that the human LTRPC2 gene is activated by intracellular ADP ribose or NAD and functions as a calcium permeable non-selective cation channel (Sano, Y. et al., Science, 293, 1327-1330, 2001). Though it has been suggested that the controlling mechanism of LTRPC2 by ADP-ribose may have an important role in cellular functions (Nature, 411, 6837, 595-599, 2001), it is not clear about the functioning mechanism of LTRPC2 in cells and its subsequent influence upon the cells.

[0007] In addition, expression of the LTRPC2 gene in a cell prepared by cloning an immunocyte has been revealed, but its expression in actual human blood, particularly in immunocyte-containing lymphocyte, is not clear.

[0008] As has been described in the above, the fact itself that activation of PARP induces cell death is known, but the presence of a factor existing in the downstream of PARP is not clarified and its mechanism is unclear. Thus, great concern has been directed toward a method for screening a substance capable of inhibiting cell death induced by the activation of PARP, particularly a substance which is useful as a therapeutic agent and/or a preventive agent for a disease in which cell death induced by the activation of PARP is concerned (e.g., rheumatoid arthritis, neuronal death at the time of cerebral ischemia, cell death of the heart after myocardial infarction reperfusion, autoimmune destruction of β-cells of pancreatic islets of Langerhans, cell death after shock, or inflammatory reaction by immunocyte death).

DISCLOSURE OF THE INVENTION

[0009] As a result of extensive studies, the present inventors have found for the first time that activation of the LTRPC2 protein is regulated by the activation of PARP and has a function to induce cell death. In addition, it was found also for the first time that the LTRPC2 gene is expressed in human lymphocyte and that its expression level is increased in rheumatoid arthritis.

[0010] More illustratively, as shown in Example 6 which is described later, activation of LTRPC2 protein was observed when a substance known as the activator of PARP, namely MNNG or H₂O₂, was added to a cell in which the LTRPC2 protein was expressed. In addition, as shown in Example 7, when DPQ, 3-aminobenzamide or nicotinamide as a PARP inhibitor was added together with a PARP activator (e.g., MNNG or H₂O₂), activation of the LTRPC2 protein was significantly inhibited.

[0011] Further, as shown in Example 10, cell death by a PARP activator H₂O₂ was accelerated in a cell in which the LTRPC2 protein was expressed.

[0012] Also, as shown in Example 2, the LTRPC2 gene was frequently expressed in lymphocyte carrying an immune function and, as shown in Example 12, the expression level of the LTRPC2 gene was increased in a model animal of rheumatoid arthritis as one of immune diseases.

[0013] In addition, as shown in Example 17, it was found that the LTRPC2 protein accelerates cell death by streptozotocin stimulation as a type I diabetes mellitus model.

[0014] Accordingly, by selecting a substance which inhibits activation of the LTRPC2 protein, a substance capable of inhibiting cell death induced by the activation of PARP can be identified, and furthermore, a substance useful as a therapeutic drug for a disease caused by cell death, for example, a therapeutic drug for rheumatoid arthritis as an immune disease, neuronal death after cerebral ischemia or autoimmune destruction of β-cells of pancreatic islets of Langerhans in type I diabetes mellitus, can be found out. The present invention provides a screening system based on these findings.

[0015] Accordingly, the present invention relates to

[0016] (1) a method for screening a substance useful for inhibiting cell death, characterized in that it comprises

[0017] a step of allowing a substance to be tested to contact with a cell expressing a polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2, SEQ ID NO:4 or SEQ ID NO:14 or a variation functionally equivalent thereof, under such a condition that the aforementioned polypeptide or a variation functionally equivalent thereof can be activated, and

[0018] a step of analyzing inhibition of the activation of the aforementioned polypeptide or a variation functionally equivalent thereof,

[0019] (2) a process for producing a pharmaceutical composition for cell death inhibition, characterized in that it comprises

[0020] a step of carrying out screening using the screening method described in (1), and

[0021] a step of preparing a pharmaceutical preparation using a substance obtained by the aforementioned screening,

[0022] (3) (i) a polypeptide which comprises the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14 and also exhibiting the LTRPC2 protein activity, or (ii) a polypeptide which comprises an amino acid sequence in which one or several amino acids in the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14 are substituted, deleted and/or inserted and also exhibiting the LTRPC2 protein activity (with the proviso that a polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2 is excluded),

[0023] (4) a polypeptide which consists of the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14,

[0024] (5) a polynucleotide which encodes the polypeptide according to (3) or (4),

[0025] (6) a vector which comprises the polynucleotide according to (5),

[0026] (7) a cell which comprises the vector according to (6), and

[0027] (8) a process for producing the polypeptide according to (3) or (4), characterized in that it comprises a step of culturing the cell according to (7).

BEST MODE FOR CARRYING OUT THE INVENTION

[0028] The following describes the present invention in detail.

[0029] Both of apoptosis and necrosis are included in the term “cell death” as used herein. Apoptosis is a programmed cell death which is a cell death positively induced by the cell itself under a physiological condition. On the other hand, necrosis indicates death of a part of the living body and is a cell death induced by force under a non-physiological condition.

[1] Polypeptide and Polynucleotide of the Present Invention

[0030] The polypeptides consisting of the amino acid sequences represented by SEQ ID NO:4 and SEQ ID NO:14 are natural type LTRPC2 proteins respectively derived from rat and mouse. The “polypeptide consisting of the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14” or a variation functionally equivalent thereof (with the proviso that a polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2 is excluded) is in itself a novel polypeptide and included in the polypeptide of the present invention.

[0031] As the variation functionally equivalent of the “polypeptide consisting of the amino acid sequence represented by SEQ ID NO:4”, for example,

[0032] (1) a polypeptide which comprises the amino acid sequence represented by SEQ ID NO:4 and also shows the LTRPC2 protein activity;

[0033] (2) a polypeptide which comprises an amino acid sequence in which one or two or more, preferably from 1 to 5, more preferably from 1 to 3, further preferably one, of amino acids in the amino acid sequence represented by SEQ ID NO:4 are substituted, deleted and/or inserted and also shows the LTRPC2 protein activity;

[0034] (3) a partial fragment of a polypeptide which consists of the amino acid sequence represented by SEQ ID NO:4 and is also a partial fragment showing the LTRPC2 protein activity; or

[0035] (4) a polypeptide which comprises an amino acid sequence having a homology of 84% or more (preferably 90% or more, more preferably 95% or more, further preferably 98% or more, and particularly preferably 99% or more) with the amino acid sequence represented by SEQ ID NO:4 and also shows the LTRPC2 protein activity, and the like may be exemplified.

[0036] Also, as the variation functionally equivalent of the “polypeptide consisting of the amino acid sequence represented by SEQ ID NO:14”, for example,

[0037] (1) a polypeptide which comprises the amino acid sequence represented by SEQ ID NO:14 and also shows the LTRPC2 protein activity;

[0038] (2) a polypeptide which comprises an amino acid sequence in which one or two or more, preferably from 1 to 5, more preferably from 1 to 3, further preferably one, of amino acids in the amino acid sequence represented by SEQ ID NO:14 are substituted, deleted and/or inserted and also shows the LTRPC2 protein activity;

[0039] (3) a partial fragment of a polypeptide which consists of the amino acid sequence represented by SEQ ID NO:14 and is also a partial fragment showing the LTRPC2 protein activity; or

[0040] (4) a polypeptide which comprises an amino acid sequence having a homology of 84% or more (preferably 90% or more, more preferably 95% or more, further preferably 98% or more, and particularly preferably 99% or more) with the amino acid sequence represented by SEQ ID NO:14 and also shows the LTRPC2 protein activity, and the like may be exemplified.

[0041] The term “homology” as used herein means a value obtained using the b12seq program (Tatiana A. Tatusova and Thomas L. Madden, FEMS Microbiol. Lett., 174, 247-250, 1999) of a BLAST package [sgi 32 bit version, version 2.0.12; obtained from National Center for Biotechnology Information (NCBI)]. As parameters in this case, “blastp” is used as the “program name”, and “0” as the “Gap insertion Cost value”, “0” as the “Gap elongation Cost value” and “BLOSUM62” as the “Matrix”, respectively, as the pair-wise alignment parameters.

[0042] The term a polypeptide shows “LTRPC2 protein activity” as used in this specification means that it shows the same activity of the known human natural type LTRPC2 protein consisting of the amino acid sequence represented by SEQ ID NO:2, and it illustratively means an activity to cause permeation of ions as a result of the generation of a passage for ions by the aforementioned polypeptide by itself existing in the membrane, when a PARP activator is allowed to undergo the reaction for example under the co-expression of PARP.

[0043] In this specification, whether or not a polypeptide shows “LTRPC2 protein activity” is not particularly limited, but it can be verified for example by the following method (preferably the method described in Example 6). That is, a cell expressing PARP is transfected with an expression vector comprising a polynucleotide coding for the LTRPC2 protein. ⁸⁶Rb⁺ is incorporated in advance into the thus obtained cells and then a PARP activator is added thereto. Release of ⁸⁶Rb⁺ from the cells via the LTRPC2 protein formed as the result can be verified using a change in the radioactivity of ⁸⁶Rb⁺ in the extracellular moiety or inside the cells.

[0044] A polypeptide in which an appropriate marker sequence and the like are added to the N-terminus and/or C-terminus of the amino acid sequence represented by SEQ ID NO:4 or 14 (with the proviso that it must show the LTRPC2 protein activity) can be exemplified as the “polypeptide which comprises the amino acid sequence represented by SEQ ID NO:4 or 14 and also shows the LTRPC2 protein activity” as one of the variation functionally equivalents of the “polypeptide consisting of the amino acid sequence represented by SEQ ID NO:4 or 14”. As the aforementioned marker sequence, a sequence for confirming expression of a peptide, for confirming intracellular localization or for easily carrying out purification and the like can be used, and its examples include FLAG epitope, hexa-histidine tag, hemagglutinin tag, myc epitope and the like.

[0045] Origin of the variation functionally equivalent of the “polypeptide consisting of the amino acid sequence represented by SEQ ID NO:4 or 14” is not limited to human, rat or mouse. For example, the aforementioned variation functionally equivalent include not only a natural allele mutant of the polypeptide consisting of the amino acid sequence represented by SEQ ID NO:4 or 14 in human, rat or mouse (with the proviso that it shows the LTRPC2 protein activity), or a polypeptide formed by a amino acid substitution such as single nucleotide polymorphism (SNP) or the like (with the proviso that it shows the LTRPC2 protein activity), but also a naturally existing variation functionally equivalent derived from a living thing other than human, rat and mouse [e.g., a mammal other than human and rat (e.g., hamster or dog)]. Also included are polypeptides and the like which are artificially modified by genetic engineering techniques based on these natural polypeptides, particularly the amino acid sequence represented by SEQ ID NO:4 or 14.

[0046] The polynucleotides coding for the novel polypeptides of the present invention are by themselves novel ones and therefore are included in the polynucleotide of the present invention. The polynucleotide of the present invention is preferably a polynucleotide coding for a polypeptide consisting of the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14, more preferably a polynucleotide comprising a sequence comprising bases of from the 84th position to the 4,610th position in the nucleotide sequence represented by SEQ ID NO:3 or comprising a sequence comprising bases of from the 36th position to the 4,559th position in the nucleotide sequence represented by SEQ ID NO:13. Further preferred is a sequence comprising bases of from the 84th position to the 4,610th position in the nucleotide sequence represented by SEQ ID NO:3. In this connection, both of DNA and RNA are included in the term “polynucleotide” as used herein.

[0047] The polypeptide or polynucleotide of the present invention can be used as a tool for screening a substance for a cell death inhibition.

[2] Cell for Screening Use and Expression Vector and Cell of the Present Invention

[0048] The polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2 is a known human natural type LTRPC2 protein. The polypeptides comprising the amino acid sequences represented by SEQ ID NO:2, SEQ ID NO:4 and SEQ ID NO:14 and variation functionally equivalents thereof are generally referred to as “LTRPC2 protein”.

[0049] As the variation functionally equivalent of the “polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2”, for example,

[0050] (1) a polypeptide which comprises the amino acid sequence represented by SEQ ID NO:2 and also shows the LTRPC2 protein activity;

[0051] (2) a polypeptide which comprises an amino acid sequence in which one or two or more, preferably from 1 to 5, more preferably from 1 to 3, further preferably one, of amino acids in the amino acid sequence represented by SEQ ID NO:2 are substituted, deleted and/or inserted and also shows the LTRPC2 protein activity;

[0052] (3) a partial fragment of a polypeptide which consists of the amino acid sequence represented by SEQ ID NO:2 and is also a partial fragment showing the LTRPC2 protein activity; or

[0053] (4) a polypeptide which comprises an amino acid sequence having a homology of 84% or more (preferably 90% or more, more preferably 95% or more, further preferably 98% or more, and particularly preferably 99% or more) with the amino acid sequence represented by SEQ ID NO:2 and also shows the LTRPC2 protein activity, or the like can be exemplified. Similar to the case of the variation functionally equivalent of the polypeptide consisting of the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14, its origin is not limited, and a polypeptide artificially modified by genetic engineering techniques is also included therein.

[0054] The cell to be used in the screening method of the present invention (to be called cell for screening) is not particularly limited, with the proviso that it is a cell expressing the aforementioned LTRPC2 protein, and any one of the cells produced by genetic engineering techniques and the naturally occurring cells can be used, but it is desirable to use a cell produced by genetic engineering techniques. Also, a cell expressing a polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2 or a variation functionally equivalent thereof is desirable, and a cell expressing a polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2, SEQ ID NO:4 or SEQ ID NO:14 is more desirable. The cell for screening can be used as a screening tool for a substance for cell death inhibition.

[0055] A vector containing the polynucleotide of the present invention and a cell containing this vector are respectively novel and included in the vector of the present invention and the cell of the present invention. The cell of the present invention is included in the aforementioned cell for screening use and can be used in the screening of the present invention.

[3] Method for Producing Cell for Screening Use

[0056] Though the method for producing cell for screening use is not particularly limited, it can be obtained, for example, by ligating a polynucleotide coding for the LTRPC2 protein into an appropriate vector DNA and transforming a host cell (preferably a eucaryote, particularly preferably CHO cell). Also, it is possible to effect expression of the polynucleotide in respective host cell by introducing an appropriate promoter and a sequence related to gene expression into such a vector.

[0057] The method for producing a polynucleotide coding for the LTRPC2 protein (includes the polynucleotide of the present invention), which can be used for the production of the cell for screening use, is not particularly limited, but (1) a method which uses PCR, (2) a method which uses a usual genetic engineering technique (namely, a method in which a transformant containing the cDNA of interest is selected from transformants transformed with a cDNA library), (3) a chemical synthesis method or the like can be exemplified. The following describes respective production methods one by one. In this connection, though the following descriptions are described with reference to the polynucleotide of the present invention, LTRPC2 protein-encoding polynucleotides other than the polynucleotide of the present invention can also be produced in the same manner.

[0058] By the method which uses PCR, the polynucleotide of the present invention can be produced for example by the following procedure.

[0059] That is, mRNA is extracted from a cell or tissue having the ability to produce the polypeptide of the present invention. Next, based on the nucleotide sequence of a polynucleotide coding for the polypeptide of the present invention, a set of two primers which can sandwich complete length mRNA corresponding to the polypeptide of the present invention or a set of two primers which can sandwich a partial mRNA region thereof are prepared. By carrying out the reverse transcriptase-polymerase chain reaction (RT-PCR), complete length cDNA coding for the polypeptide of the present invention or a part thereof can be obtained.

[0060] More illustratively, total RNA containing the mRNA coding for the polypeptide of the present invention is extracted by a known method from a cell or tissue having the ability to produce the polypeptide of the present invention. Examples of the extraction method include a guanidine thiocyanate hot phenol method, a guanidine thiocyanate-guanidine hydrochloride method, a guanidine thiocyanate cesium chloride method and the like, but it is desirable to use the guanidine thiocyanate cesium chloride method. The cell or tissue having the ability to produce the polypeptide of the present invention can be specified for example by the Northern blotting method which uses a polynucleotide coding for the polypeptide of the present invention or a part thereof or the Western blotting method which uses an antibody specific for the polypeptide of the present invention.

[0061] Subsequently, the thus extracted mRNA is purified. Purification of the mRNA can be carried out in accordance with a conventional method; for example, it can be purified by effecting adsorption of the mRNA to an oligo(dT) cellulose column and then eluting the same. As occasion demands, the mRNA can be further fractionated by a sucrose density gradient centrifugation or the like method. In addition, a commercially available already extracted and purified mRNA can also be used without carrying out extraction of the mRNA.

[0062] Next, a single-stranded cDNA is synthesized by carrying out a reverse transcriptase reaction of the thus purified mRNA in the presence, for example, of a random primer, an oligo(dT) primer and/or a custom-synthesized primer. This synthesis can be carried out by a conventional method. The cDNA of interest can be amplified by carrying out PCR using the thus obtained single-stranded cDNA and two primers sandwiching the complete length or a partial region of the polynucleotide of interest. The thus obtained DNA is fractionated by an agarose gel electrophoresis or the like. As occasion demands, a DNA fragment of interest can also be obtained by digesting the aforementioned DNA with restriction enzymes and the like and ligating the fragments. In addition, a DNA fragment of interest can also be obtained from a genomic DNA.

[0063] According to the method which uses a usual genetic engineering technique, the polynucleotide of the present invention can be produced, for example, by the procedure described in b) The second production method of 1) Method for producing protein genes in “Mode for Carrying Out the Invention” of WO 01/34785.

[0064] Regarding the method which uses a chemical synthesis, the polynucleotide of the present invention can be produced, for example, by the procedures described in c) The third production method and d) The fourth production method of 1) Method for producing protein genes in “Mode for Carrying Out the Invention” of the aforementioned patent document. More illustratively, it can also be obtained by ligating nucleotide fragments produced by a chemical synthesis method. In addition, each polynucleotide (oligonucleotide) can be synthesized using a DNA synthesizer (e.g., Oligo 1000M DNA Synthesizer (manufactured by Beckman), 394 DNA/RNA Synthesizer (manufactured by Applied Biosystems) or the like).

[0065] Sequence determination of the DNA samples obtained by the various methods so far described can be carried out, for example, by the Maxam-Gilbert chemical modification method (Maxam, A. M. and Gilbert, W., “Methods in Enzymology”, 65, 499-559, 1980), the dideoxy nucleotide chain termination method (Messing, J. and Vieira, J., Gene, 19, 269-276, 1982).

[0066] A host cell (preferably a eucaryote) can be transformed by integrating the thus isolated polynucleotide of the present invention into an appropriate vector DNA. Also, it is possible to effect expression of the polynucleotide in respective host cell by introducing an appropriate promoter and a sequence related to gene expression into such a vector.

[0067] As the host cell and expression vector which can be used for the production of the cell for screening use, for example, known host cell and expression vector generally usable in the genetic engineering can be used.

[0068] For example, cells of a vertebrate, an insect, a yeast and the like are included in the host cell of a eucaryote, and examples of the vertebrate cells include a monkey cell COS cell (Gluzman, Y., Cell, 23, 175-182, 1981), CHO dhfr⁻ cell which is a dihydrofolate reductase-deficient strain of Chinese hamster ovary cell (CHO) (Urlaub, G. and Chasin, L. A., Proc. Natl. Acad. Sci. USA, 77, 4216-4220, 1980), a human fetal kidney derived HEK 293 cell and a 293-EBNA cell (manufactured by Invitrogen) prepared by introducing Epstein-Barr virus EBNA-1 gene into the aforementioned HEK 293 cell.

[0069] When CHO cell is used as the host cell, a transformed cell which stably produce the LTRPC2 protein can be obtained by co-transfecting a vector capable of expressing a neo gene which functions as a G418 resistance marker, such as pRSVneo (Sambrook, J. et al., “Molecular Cloning—A Laboratory Manual”, Cold Spring Harbor Laboratory, NY, 1989), pSV2-neo (Southern, P. J. and Berg, P., J. Mol. Appl. Genet., 1, 327-341, 1982) or the lie, together with an expression vector containing a polynucleotide coding for the LTRPC2 protein, and by selecting a G418-resistant colony.

[0070] As the expression vector for vertebrate cells, a vector having a promoter generally positioned at the upstream of the polynucleotide to be expressed, an RNA splicing site, polyadenylation site, transcription termination sequence and the like can be used, which may further have a replication origin as occasion demands. Examples of the aforementioned expression vector include pSV2dhfr having SV40 early promoter (Subramani, S. et al., Mol. Cell. Biol., 1, 854-864, 1981), pEF-BOS having a human elongation factor promoter (Mizushima, S. and Nagata, S., Nucleic Acids Res., 18, 5322, 1990), pCEP4 having a cytomegalovirus promoter (manufactured by Invitrogen), pcDNA3.1 (+) (manufactured by Invitrogen) and the like.

[0071] The aforementioned expression vector can be incorporated into cells for example by the DEAE-dextran method (Luthman, H. and Magnusson, G., Nucleic Acids Res., 11, 1295-1308, 1983), the calcium phosphate-DNA coprecipitation method (Graham, F. L. and van der Ed, A. J., Virology, 52, 456-457, 1973), a method which uses a commercially available transfection reagent (e.g., FuGENE™6 Transfection Reagent; manufactured by Roche Diagnostics), the electroporation method (Neumann, E. et al., EMBO J., 1, 841-845, 1982) or the like.

[0072] The cell containing a polynucleotide coding for the LTRPC2 protein can be cultured in accordance with a conventional method, and the LTRPC2 protein is produced on the cell surface by the aforementioned culturing. As the medium which can be used in the aforementioned culturing, various media conventionally used in response to the employed host cells can be optionally selected. For example, in the case of CHO cell, a medium prepared by adding a serum component such as fetal bovine serum (FBS) or the like, as occasion demands to, for example, Dulbecco's modified Eagle's minimum essential medium or the like medium can be used. Also, in the case of the 293 cell, a medium prepared by adding G418 to Dulbecco's modified Eagle's minimum essential medium or the like medium supplemented with a serum component such as a fetal bovine serum (FBS) or the like can be used.

[4] Method for Screening a Substance Useful for Cell Death Inhibition

[0073] The method of the present invention for screening a substance useful for cell death inhibition includes (1) a step of allowing a substance to be tested to contact with a cell expressing the LTRPC2 protein under such a condition that the LTRPC2 protein can be activated and (2) a step of analyzing inhibition of the activation of the LTRPC2 protein.

[0074] According to the screening method of the present invention, a substance to be tested is allowed to contact with the cell for screening use under such a condition that the LTRPC2 protein can be activated. As the condition under which the LTRPC2 protein can be activated, in the presence of a LTRPC2 protein activator can for example be cited. As the aforementioned LTRPC2 protein activator, ADP ribose or NAD or a PARP activator (e.g., MNNG or H₂O₂) can for example be cited.

[0075] According to the screening method of the present invention, though not particularly limited, for example, the cell can be contacted with a substance to be tested after activation of the LTRPC2 protein or the cell can be contacted with a substance to be tested simultaneously with the activation of the LTRPC2 protein. In the former case, activation of the LTRPC2 protein is inhibited when the substance to be tested is a substance which inhibits activation of the LTRPC2 protein, and on the contrary, activation of the LTRPC2 protein is maintained when the substance to be tested is not a substance which inhibits activation of the LTRPC2 protein. In the latter case, on the other hand, activation of the LTRPC2 protein does not occur or is attenuated when the substance to be tested is a substance which inhibits activation of the LTRPC2 protein. On the contrary, activation of the LTRPC2 protein occurs when the substance to be tested is not a substance which inhibits activation of the LTRPC2 protein.

[0076] When the screening method of the present invention is used, a substance which inhibits activation of the LTRPC2 protein (namely an antagonist) can be screened. As has been found for the first time by the inventors, activation of the LTRPC2 protein is controlled by the activation of PARP. In addition, it is well known that cell death is induced by the activation of PARP. Accordingly, it has been revealed for the first time by the inventors that activation of the LTRPC2 protein is induced by the activation of PARP, and cell death is further induced as the result. Thus, a substance which inhibits activation of the LTRPC2 protein can inhibit a cell death induced by the activation of PARP and therefore is useful as the active ingredient of a therapeutic and/or preventive agent for a disease in which the cell death induced by the activation of PARP is concerned.

[0077] More illustratively, based on the difference in the method for analyzing activation of the LTRPC2 protein, for example,

[0078] (a) a screening method which uses a patch-clamp method,

[0079] (b) a screening method which uses influx or efflux of a radioisotope ion,

[0080] (c) a screening method which uses efflux of Rb⁺ ion, or

[0081] (d) a screening method which uses an intracellular Ca₊ indicator may be exemplified as the screening method of the present invention.

[0082] When a substance which inhibits activation of the LTRPC2 protein and is useful as a cell death inhibitor is screened making use of the aforementioned patch-clamp method of (a), whether or not the activation of LTRPC2 protein is inhibited can be analyzed by measuring whole cell current in the cell for screening use using, for example, a whole-cell patch-clamp method (Hille, B., “Ionic Channels of Excitable Membranes”, 2nd Ed., 1992, Sinauer Associates Inc., Mass.). That is, though not particularly limited, the screening method of the present invention which uses a patch-clamp method includes, for example, a step in which the cell for screening use membrane potential-clamped by the whole-cell patch-clamp method and said cell for screening use is allowed to contact with a substance to be tested under such a condition that the LTRPC2 protein can be activated and a step in which a change in the whole cell current in said cell for screening use is analyzed.

[0083] More illustratively, whole cell current in the cell for screening use is measured by membrane potential-clamped the cell for screening use by the whole-cell patch-clamp method and adding an LTRPC2 protein activating compound (e.g., ADP ribose, NAD, H₂O₂ or MNNG). In that case, a solution containing 145 mmol/L NaCl, 5 mmol/L KCl, 2 mmol/L CaCl₂, 2 mmol/L MgCl₂ and 10 mmol/L HEPES-Na (pH 7.4) is used as the extracellular solution, and a solution containing 150 mmol/L CsCl, 5 mmol/L MgCl₂ and 10 mmol/L HEPES-Cs (pH 7.2) can be used as the intracellular solution. By subsequently measuring changes in the current when a substance to be tested is added to the extracellular solution or intracellular solution, a substance which inhibits activation of the LTRPC2 protein can be screened. For example, in case that change in the whole cell current which is generated by the activation stimulus of the LTRPC2 protein disappears or is attenuated in the cell for screening use when a substance to be tested is added, it can be judged that said substance to be tested is a substance which inhibits activation of the LTRPC2 protein.

[0084] When a substance which inhibits activation of the LTRPC2 protein and is useful as a cell death inhibitor is screened making use of the aforementioned efflux of radioisotope ion of (b), its channel activity can be measured for example using respective radioisotope of Ca²⁺, Na⁺ or K⁺ ion as the index (Sidney P. Colowick and Nathan O. Kaplan “Methods in Enzymology”, 88 (1), 1982, Academic Press, 346-347). This analyzing method is based on a well known finding that the LTRPC2 protein causes permeation of Ca²⁺, Na⁺ or K⁺ ion (Sano, Y. et al., Science, 293, 1327-1330, 2001).

[0085] Though not particularly limited, the screening method of the present invention which uses efflux of a radioisotope ion includes, for example, a step in which a radioisotope is incorporated into the cell for screening use and then said cell for screening use is allowed to contact with a substance to be tested under such a condition that the LTRPC2 protein can be activated and a step in which amount of the radioactivity discharged into the extracellular moiety of the cell for screening use, or amount of the radioactivity remained in the cell is analyzed.

[0086] More illustratively, it can be measured using ⁴⁵Ca²⁺, ²²Na⁺ or ⁴²K⁺ as the radioisotope of each ion. When K⁺ is used, K⁺ is incorporated into the cell in advance and then K⁺ remained in the extracellular solution is removed. Thereafter, since the radioisotope K⁺ is permeated when the LTRPC2 protein is activated using an LTRPC2 protein activator, the radioactivity in the extracellular solution (namely, the radioactivity discharged into the extracellular moiety) or the radioactivity remained in the cell can be used as the index of the channel activity. In case that ⁴⁵Ca²⁺ or ²²Na⁺ is used, the radioisotope permeates when the LTRPC2 protein is activated using an LTRPC2 protein activator under a condition of putting the ⁴⁵Ca²⁺ or ²²Na⁺ in the reaction solution, so that the radioactivity in the extracellular solution (namely, the radioactivity remained in the extracellular moiety) or the radioactivity influxed into the cell can be used as the index of the channel activity (Experimental Medicine Supplement “Cultured Cell Experimentation Methods for Molecular Biology Studies”, edited by T. Kuroki, N. Kyo and K. Senda, 1995, published by Yodosha; to be referred to as reference 1 hereinafter). In that case, a substance which inhibits activation of the LTRPC2 protein can be screened by adding a substance to be tested in the presence of an LTRPC2 protein activator and measuring the radioactivity in the extracellular solution (namely, the radioactivity discharged into the extracellular moiety) or the radioactivity remained in the cell. More illustratively, it can be carried out in accordance with the “(c) screening method which uses efflux of Rb⁺ ion” which is described below.

[0087] In general, an ion channel capable of effecting permeation of K⁺ ion can also pass Rb⁺ ion similar to the case of K⁺ ion, so that the channel activity can be measured using efflux of a radioisotope ⁸⁶Rb⁺ as the index (Sidney P. Colowick and Nathan O. Kaplan “Methods in Enzymology”, 88 (1), 1982, Academic Press, 346-347; to be referred to as reference 2 hereinafter).

[0088] Though not particularly limited, the screening method of the present invention in which a substance which inhibits activation of the LTRPC2 protein and is useful as a cell death inhibitor is screened making use of the aforementioned efflux of Rb⁺ ion of (c) includes, for example, a step in which a radioisotope ⁸⁶Rb⁺ ion is incorporated into the cell for screening use and then said cell for screening use is allowed to contact with a substance to be tested under such a condition that the LTRPC2 protein can be activated and a step in which amount of the radioactivity of ⁸⁶Rb⁺ discharged into the extracellular moiety of the cell for screening use, or amount of the radioactivity of ⁸⁶Rb⁺ remained in the cell is analyzed.

[0089] According to the screening method of the present invention which uses efflux of Rb⁺ ion, ⁸⁶Rb⁺ can be incorporated into the aforementioned cell by incubating the cell for screening use together with ⁸⁶RbCl (e.g., at 37° C. for 24 hours) (reference 1), The un-incorporated ⁸⁶Rb⁺ is removed by washing the cell with usual physiological saline. Since the amount of ⁸⁶Rb⁺ discharged into the extracellular moiety is increased when the LTRPC2 protein is activated, the radioactivity of ⁸⁶Rb⁺ in the extracellular solution or the radioactivity of ⁸⁶Rb⁺ remained in the cell can be used as the index of the channel activity.

[0090] More illustratively, for example, the cell for screening use incorporated in advance with ⁸⁶Rb⁺ is incubated (e.g., at 37° C. for 30 minutes) in a solution (e.g., physiological saline) containing a substance to be tested, in the presence of an LTRPC2 protein, and then the radioactivity of 86Rb⁺ in the extracellular solution or the radioactivity of ⁸⁶Rb⁺ remained in the cell is measured. In that case, it is desirable to carry out the same operation as a negative control using a solution which does not contain the substance to be tested and in the absence of the LTRPC2 protein activator, and to carry out the same operation as a positive control using a solution which does not contain the substance to be tested and in the presence of the LTRPC2 protein activator. Since the LTRPC2 protein is not activated in the aforementioned negative control, ⁸⁶Rb⁺ is not discharged into the extracellular moiety, while ⁸⁶Rb⁺ is discharged into the extracellular moiety in the positive control because of the activation of LTRPC2 protein. When (1) discharge of ⁸⁶Rb⁺ into the extracellular moiety is nor observed similar to the case of the aforementioned negative control or (2) discharged amount of ⁸⁶Rb⁺ into the extracellular moiety is reduced in comparison with the aforementioned positive control, in case that a substance to be tested is added in the presence of an LTRPC2 protein activator, it can be judged that the aforementioned substance to be tested is a substance which inhibits activation of the LTRPC2 protein. It is desirable that the screening method of the present invention which uses discharge of Rb⁺ ion is carried out under the conditions which are described later in Example 7.

[0091] When a substance which inhibits activation of the LTRPC2 protein and is useful as a cell death inhibitor is screened making use of the aforementioned intracellular Ca⁺ indicator of (d), Fluo3-AM or the like can for example be used as the intracellular Ca⁺ indicator. An intracellular Ca⁺ indicator can optically detect changes in the intracellular Ca⁺ concentration accompanied by the opening of the LTRPC2 protein (Experimental Medicine Supplement “Intracellular Calcium Experimentation Protocol”, edited by S. Kudo, 1996, published by Yodosha). Activity of the LTRPC2 protein can be measured by the use of these indicators, and it is possible to screen a compound which inhibits activation of the LTRPC2 protein, by comparing changes in the amount at the time of the activation of LTRPC2 protein in the presence and absence of a substance to be tested. Though not particularly limited, the screening method of the present invention which uses an intracellular Ca⁺ indicator includes, for example, a step in which an intracellular Ca⁺ indicator is incorporated into the cell for screening use and then said cell for screening use is allowed to contact with a substance to be tested under such a condition that the LTRPC2 protein can be activated and a step in which changed amount of the intracellular Ca⁺ indicator in the aforementioned cell for screening use is optically analyzed.

[0092] More illustratively, when the amount of Ca⁺ permeating into the cell is reduced or disappears in comparison with the case of the absence of a substance to be tested, in case that the substance to be tested is added in the presence of an LTRPC2 protein activator, it can be judged that the aforementioned substance to be tested is a substance which inhibits activation of the LTRPC2 protein.

[0093] The substances to be tested as the objects to be selected by the screening method of the present invention are not particularly limited, but various conventionally known compounds (including peptides) registered in Chemical File, a group of compounds obtained by the combinatorial chemistry techniques (Terrett, N. K. et al., Tetrahedron, 51, 8135-8137, 1995), or a group of random peptides prepared by applying the phage display method (Felici, F. et al., J. Mol. Biol., 222, 301-310, 1991) and the like can be used. Also, microorganisms, plants, marine organisms, animal-derived natural components (e.g., culture supernatants or tissue extracts) and the like can also be used as the substances to be tested by the screening. In addition, compounds (including peptides) prepared by chemically or biologically modifying the compounds (including peptides) selected by the screening method of the present invention can also be used.

[5] Method for Producing Pharmaceutical Composition for Cell Death Inhibition

[0094] A method for producing a pharmaceutical composition for cell death inhibition, characterized in that it comprises a step of carrying out a screening using the screening method of the present invention and a step of preparing a pharmaceutical preparation using a substance obtained by the aforementioned screening, is included in the present invention.

[0095] The pharmaceutical preparation which comprises a substance obtained by the screening method of the present invention as the active ingredient can be prepared by using carriers, fillers and/or other additive agents generally used in preparing medicaments, in response to the type of the aforementioned active ingredient.

[0096] Examples of the administration include oral administration by tablets, pills, capsules, granules, fine subtilaes, powders, solutions for oral use and the like and parenteral administration by injections (e.g., intravenous, intramuscular, intraarticular or the like), suppositories, percutaneous preparations, transmucosal preparations and the like. Particularly in the case of peptides which are digested in the stomach, parenteral administration such as intravenous injection or the like is desirable.

[0097] In the solid composition for oral administration, one or more active substances can be mixed with at least one inert diluent such as lactose, mannitol, glucose, microcrystalline cellulose, hydroxypropylcellulose, starch, polyvinyl pyrrolidone, aluminum magnesium silicate or the like. In the usual way, the aforementioned composition may contain other additives than the inert diluent, such as a lubricant, a disintegrating agent, a stabilizing agent, a solubilizing or solubilization assisting agent and the like. If necessary, tablets or pills may be coated with a sugar coating or a film of a gastric or enteric substance.

[0098] The liquid composition for oral administration can include, for example, emulsions, solutions, suspensions, syrups or elixirs and can contain a generally used inert diluent such as purified water or ethanol. In addition to the inert diluent, the aforementioned composition can also contain a moistening agent, a suspending agent a sweetener, an aromatic or an antiseptic.

[0099] The injections for parenteral administration can include aseptic aqueous or non-aqueous solutions, suspensions or emulsions. As a diluent, the water-soluble aqueous solutions or suspensions can include distilled water for injection, physiological saline or the like. Examples of the diluent for use in the non-aqueous solutions or suspensions include propylene glycol, polyethylene glycol, plant oil (e.g., olive oil), alcohols (e.g., ethanol), polysorbate 80 or the like. The aforementioned composition can further contain a moistening agent, an emulsifying agent, a dispersing agent, a stabilizing agent, a solubilizing or solubilization assisting agent, an antiseptic or the like. The aforementioned composition can be sterilized, for example, by filtration through a bacteria retaining filter, blending of a germicide or irradiation. Alternatively, it can be used by firstly making into a sterile solid composition and dissolving it in sterile water or a sterile solvent for injection prior to its use.

[0100] The dose can be optionally decided by taking into consideration strength of the activity of the active ingredient, namely a substance which inhibits activation of the LTRPC2 protein or a substance obtained by the screening method of the present invention, and symptoms, age, sex and the like of each patient to be treated.

[0101] For example, in the case of oral administration, the dose is usually from 0.1 to 100 mg, preferably from 0.1 to 50 mg, per day per adult (as 60 kg body weight). In the case of parenteral administration, it is from 0.01 to 50 mg, preferably from 0.01 to 10 mg, as a mode of injections.

EXAMPLES

[0102] The following illustratively describes the present invention based on examples, but they do not limit the scope of the present invention. In this connection, unless otherwise noted, genetic engineering techniques and channel activity analysis can be carried out in accordance with the conventionally known methods (Maniatis, T. et al., “Molecular Cloning—A Laboratory Manual”, 1982, Cold Spring Harbor Laboratory, NY; Hille, B., “Ionic Channels of Excitable Membranes”, 2nd Ed., 1992, Sinauer Associates Inc., MA).

[0103] In carrying out cloning in the examples, SUPERSCRIPT First-Strand Synthesis System for RT-PCR manufactured by Invitrogen was used as the kit for reverse transcription reaction, and TOPO XL PCR Cloning Kit manufactured by Invitrogen as the cloning kit.

Example 1 Isolation of Gene Coding for Human LTRPC2 Protein and Construction of Expression Vector

[0104] A complete length cDNA coding for a human LTRPC2 protein consisting of the amino acid sequence represented by SEQ ID NO:2 (to be referred simply to as “human LTRPC2 protein” in each of the following Examples) was obtained by the reverse transcription-polymerase chain reaction (RT-PCR) using a human leukocyte mRNA as the temperate. Firstly, a single-stranded cDNA was synthesized by carrying out reverse transcription of the human leukocyte mRNA (10 ng) using the kit for reverse transcription reaction. Using this single-stranded cDNA as the template, PCR was carried out by a hot start method using Taq DNA polymerase (LA Taq DNA polymerase; manufactured by Takara Shuzo). The aforementioned PCR was carried out using an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:5 as the sense primer, and an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:6 as the antisense primer, and firstly carrying out thermal denaturation at 98° C. (1 minute) and then repeating a cycle of 98° C. (15 seconds)/65° C. (30 seconds)/72° C. (6 minutes) 35 times. As a result, a DNA fragment of about 4.7 kbp was amplified.

[0105] This DNA fragment was cloned into pCR-TOPO vector using the cloning kit. LTRPC2-cDNA alone was isolated by digesting the thus obtained plasmid DNA with a restriction enzyme EcoRI and then cloned using a pcDNA3.1 (+) plasmid (manufactured by Invitrogen). Since the pcDNA3.1 (+) plasmid has a cytomegalovirus-derived promoter sequence, it can be used for expressing the LTRPC2 protein in animal cells. When nucleotide sequence of the thus obtained clone pcDNA3.1-LTRPC2 was analyzed by the dideoxy terminator method using a DNA sequencer (ABI 3700 DNA Sequencer; manufactured by Applied Biosystems), the sequence represented by SEQ ID NO:1 was obtained.

Example 2 Expression Distribution of Human LTRPC2 Gene

[0106] Expression distribution of human LTRPC2 gene in human tissues and human blood was analyzed by the RT-PCR method. Regarding the human tissues, 5 ng of each of mRNA preparations derive from respective human tissues (manufactured by Clontech) was subjected to a DNase treatment and then to reverse transcription using a kit for reverse transcription reaction (Advantage RT-for-PCR Kit; manufactured by Clontech), thereby obtaining a single-stranded cDNA. Using this single-stranded cDNA as the template, PCR was carried out by a hot start method using Taq DNA polymerase (LA Taq DNA polymerase; manufactured by Takara Shuzo).

[0107] A 100 ml portion of human blood was collected from an anonymous in-house volunteer (healthy person), using a syringe containing heparin sodium for preventing blood coagulation. The blood sample was fractionated into eosinophil, neutrophil, lymphocyte and platelet using Ficoll-Paque reagent (manufactured by Amersham Pharmacia), and then total RNA was extracted from each of them using ISOGEN reagent (manufactured by Nippon Gene). In this case, the actual operation was carried out in accordance with respective protocols attached to the Ficoll-Paque reagent and ISOGEN reagent. A single-stranded cDNA was obtained by subjecting 20 ng of each total RNA to a DNase treatment and then to reverse transcription using the kit for reverse transcription reaction. Using this single-stranded cDNA as the template, PCR was carried out by a hot start method using Taq DNA polymerase (LA Taq DNA polymerase; manufactured by Takara Shuzo).

[0108] The aforementioned PCR was carried out using an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:7 as the sense primer, and an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:8 as the antisense primer, and firstly carrying out thermal denaturation at 98° C. (1 minute) and then repeating a cycle of 98° C. (15 seconds)/70° C. (1 minute) 30 times. Each of these primers is a sequence specific for the human LTRPC2 gene, comprising a sequence comprising bases of from the 22nd to the 4,533rd positions in the nucleotide sequence represented by SEQ ID NO:1.

[0109] When RT-PCR analysis was carried out on respective human tissues (amygdala, caudate nucleus, hippocampus, corpus callosum, substantia nigra, thalamus, cerebellum, frontal lobe, hypothalamus, spinal cord, pituitary body, whole brain, heart, placenta, lung, trachea, liver, skeletal muscle, kidney, small intestine, stomach, spleen, bone marrow, thymus, thyroid gland, salivary gland, adrenal gland, mammary gland and prostate), a DNA fragment of about 660 bp was amplified in brain, spinal cord, heart, placenta, lung, trachea, small intestine, stomach, spleen, bone marrow, thymus and leukocyte. It was revealed based on this result that the mRNA of human LTRPC2 is expressed in tissues which have been reported to be related to diseases whose cause is a cell death accompanied by the PARP activation.

[0110] In addition, when the RT-PCR analysis was carried out on human blood, a DNA fragment of about 660 bp was amplified mainly in lymphocyte. It was revealed based on this result that the human LTRPC2 is expressed mainly in lymphocyte in the human blood. Since it has been revealed that lymphocyte carries an immune function, it was suggested that the LTRPC2 gene is taking an important role in an immune function.

Example 3 Isolation of Gene Coding for Rat LTRPC2 Protein

[0111] A complete length cDNA coding for a rat LTRPC2 protein consisting of the amino acid sequence represented by SEQ ID NO:4 (to be referred simply to as “rat LTRPC2 protein” in each of the following Examples) was obtained by RT-PCR using 10 ng of a rat brain mRNA (manufactured by Clontech) as the temperate, by the same techniques of Example 1. PCR was carried out using an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:9 as the sense primer, and an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:10 as the antisense primer, and firstly carrying out thermal denaturation at 98° C. (1 minute) and then repeating a cycle of 98° C. (15 seconds)/60° C. (30 seconds)/72° C. (5 minutes) 35 times. As a result, a DNA fragment of about 4.7 kbp was amplified. When this DNA fragment was cloned into pCR-TOPO vector and nucleotide sequence of the thus obtained clone pCR-TOPO-rat LTRPC2 was analyzed, the sequence represented by SEQ ID NO:3 was obtained. The nucleotide sequence represented by SEQ ID NO:3 has an open reading frame comprising 4,527 base pairs (a sequence comprising bases of from the 84th to 4,610th positions in the nucleotide sequence represented by SEQ ID NO:3). Amino acid sequence deduced from the aforementioned open reading frame was the amino acid sequence represented by SEQ ID NO:4 comprising 1,508 amino acid residues.

[0112] The amino acid sequence represented by SEQ ID NO:4 has a homology of 84% with the amino acid sequence represented by SEQ ID NO:2 (human LTRPC2 protein). In this connection, the aforementioned numerical value of homology is a value obtained by the aforementioned BLAST retrieval.

Example 4 Expression Distribution of Rat LTRPC2 Gene

[0113] Expression distribution of rat LTRPC2 gene in rat tissues was analyzed by the RT-PCR method. A 5 ng portion of each of mRNA preparations derive from respective rat tissues (manufactured by Clontech) was subjected to a DNase treatment and then to reverse transcription using the kit for reverse transcription reaction, thereby obtaining a single-stranded cDNA. Using this single-stranded cDNA as the template, PCR was carried out by a hot start method using a Taq DNA polymerase (Platinum Taq DNA polymerase; manufactured by Invitrogen). The aforementioned PCR was carried out using an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:11 as the sense primer, and an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:12 as the antisense primer, and firstly carrying out thermal denaturation at 95° C. (1 minute) and then repeating a cycle of 95° C. (15 seconds)/62° C. (30 seconds)/72° C. (1 minute) 35 times. Each of these primers is a sequence specific for the rat LTRPC2 gene, comprising a sequence comprising bases of from the 84th to 4,610th positions in the nucleotide sequence represented by SEQ ID NO:3.

[0114] When RT-PCR analysis was carried out on respective rat tissues (brain, heart, kidney, liver, lung, pancreas, retina, skeletal muscle, spleen and testis), a DNA fragment of about 380 bp was amplified in all of the tissues, thus revealing that the mRNA of rat LTRPC2 is expressed in each of the aforementioned tissues. In addition, it was revealed based on this result that the mRNA of rat LTRPC2 is expressed in tissues which have been reported to be related to diseases whose cause is a cell death accompanied by the PARP activation.

Example 5 Expression of Human LTRPC2 Protein in Animal Cell

[0115] In order to detect channel activity of the human LTRPC2 protein, expression of the aforementioned protein was induced in an animal cell. Using the expression vector pcDNA3.1-LTRPC2 obtained in Example 1 and a reagent for transfection (LIPOFECTAMINE 2000; manufactured by Invitrogen), transfection of a Chinese hamster ovary-derived CHO dhfr⁻ cell was carried out to induce expression of the human LTRPC2 protein. In this case, the aforementioned operation was carried out in accordance with the protocol attached to the aforementioned reagent for transfection and the known method (reference 1).

Example 6 Detection of Activation of Human LTRPC2 Protein by PARP Activator

[0116] This was carried out in accordance with the known methods (reference 1 and reference 2), except for the operation illustratively described in the following.

[0117] The transfected cells obtained in Example 5 (1.6×105 cells) were incubated at 37° C. for 24 hours in the presence of ⁸⁶RbCl (1 μCi/ml) to effect incorporation of ⁸⁶Rb⁺ into the cells and then washed with physiological saline to remove the ⁸⁶Rb⁺ which was not incorporated into the cells. The thus obtained cells were incubated at room temperature for 30 minutes in physiological saline supplemented with a PARP activator MNNG (final concentration=1 mmol/liter) or H₂O₂ (final concentration=0.06%). In this connection, the same operation was carried out as a control in general physiological saline (namely, physiological saline to which MNNG or H₂O₂ was not added).

[0118] The respective cells were washed with physiological saline, and then radioactivity of the ⁸⁶Rb⁺ remained in the cells was measured. As a result, residual activity of ⁸⁶Rb⁺ was reduced to 35.6% in the cells to which MNNG was added, and to 8.9% in the cells to which H₂O₂ was added, respectively, in comparison with the control cells. (cells to which MNNG or H₂O₂ was not added). This shows that ⁸⁶Rb⁺ in the cells was effluxed into the extracellular moiety caused by the activation of human LTRPC2 protein induced by MNNG or H₂O₂. It was revealed based on this result that the human LTRPC2 protein is activated by a PARP activator MNNG or H₂O₂.

Example 7 Inhibition of Activation of Human LTRPC2 Protein by PARP Inhibitor

[0119] This was carried out in accordance with the known methods (reference 1 and reference 2), except for the operation illustratively described in the following.

[0120] The transfected cells obtained in Example 5 (1.6×105 cells) were incubated at 37° C. for 24 hours in the presence of ⁸⁶RbCl (1 μCi/ml) to effect incorporation of ⁸⁶Rb⁺ into the cells and then washed with physiological saline to remove the ⁸⁶Rb⁺ which was not incorporated into the cells. The thus obtained cells were incubated at room temperature for 30 minutes in physiological saline supplemented with a PARP inhibitor DPQ (final concentration=100 μmol/liter), 3-aminobenzamide (final concentration=1 mmol/liter) or nicotinamide (final concentration=1 mmol/liter), in the presence of MNNG (final concentration=1 mmol/liter) or H₂O₂ (final concentration=0.06%). In this connection, the same operation was carried out as a control in physiological saline (namely, physiological saline to which DPQ, 3-aminobenzamide or nicotinamide was not added), in the absence of MNNG and H₂O₂.

[0121] The respective cells were washed with physiological saline, and then radioactivity of the ⁸⁶Rb⁺ remained in the cells was measured. As a result, residual activity of ⁸⁶Rb⁺ in respective cells to which the PARP inhibitor was added was similar to that of the control cells (cells to which MNNG or H₂O₂ was not added), namely the cells in which activity of the human LTRPC2 protein was not induced. More illustratively, the cells to which DPQ was added showed 93.4% (in the case of the presence of H₂O₂) or 95.5% (in the case of the presence of MNNG) of the ⁸⁶Rb⁺ residual activity. In the same manner, the cells to which 3-aminobenzamide was added showed 91.9% (in the case of the presence of H₂O₂) or 96.2% (in the case of the presence of MNNG) of the ⁸⁶Rb⁺ residual activity, and the cells to which nicotinamide was added showed 57.8% (in the case of the presence of H₂O₂) or 95.9% (in the case of the presence of MNNG) of the ⁸⁶Rb⁺ residual activity.

[0122] This shows that ⁸⁶Rb⁺ in the cells was not effluxed into the extracellular moiety, or the efflux was reduced, due to inhibition of the activation of human LTRPC2 protein caused by DPQ, 3-aminobenzamide or nicotinamide. It was revealed based on this result that the activation of human LTRPC2 protein by MNNG or H₂O₂ is inhibited by a PARP inhibitor DPQ, 3-aminobenzamide or nicotinamide.

Example 8 Comparison of Human LTRPC2 Protein Inhibition and PARP Inhibition by PARP Inhibitor

[0123] In order to verify that the human LTRPC2 protein inhibition by PARP inhibitor, shown in Example 7, occurs via PARP, IC₅₀ value of the human LTRPC2 protein inhibition and IC₅₀ value of the PARP inhibition were compared and examined.

[0124] IC₅₀ value of the LTRPC2 inhibition by each of the aforementioned PARP inhibitors DPQ, 3-aminobenzamide and nicotinamide was examined by the method of Example 7, by adding varied amounts of the inhibitors. As a result, IC₅₀ values of the human LTRPC2 protein inhibition by DPQ, 3-aminobenzamide and nicotinamide were 0.20 μM, 117 μM and 541 μM, respectively.

[0125] IC₅₀ value of the PARP inhibition was examined by the following method. The transfected cells obtained in Example 5 were incubated at room temperature for 30 minutes in physiological saline supplemented with a PARP activator MNNG (final concentration=1 mmol/liter) or H₂O₂ (final concentration=0.06%) and varied amount of the PARP inhibitor used in the above. In this connection, the same operation was carried out as a control in general physiological saline (namely, physiological saline to which MNNG or H₂O₂ was not added). Next, the cells after removal of the physiological saline supplemented with respective activator and inhibitor were incubated with 0.2 nCi/μl in final concentration of ³H-NAD at 37° C. for 40 minutes. Subsequently, the reaction was stopped by adding TCA to the cells to a final concentration of 10% and the cells were incubated at 4° C. for 30 minutes. Thereafter, the un-incorporated ³H-NAD was removed by washing the cells twice with 5% TCA. The thus washed cells were lysed with a solution containing 2% SDS and 0.1 M NaOH, and then the ³H radioactivity contained in the cells was measured. As a result, IC₅₀ values of the PARP inhibition by DPQ, 3-aminobenzamide and nicotinamide were 0.26 μM, 71.7 μM and 335 μM, respectively.

[0126] Since the respective IC₅₀ values of LTRPC2 inhibition and PARP inhibition approximated to each other, it was confirmed that the LTRPC2 inhibition was due to the PARP inhibition.

Example 9 Expression of Human LTRPC2 Protein in Animal Cell

[0127] In order to clarify function of the human LTRPC2 protein in cells, expression of the aforementioned protein was induced in an animal cell. Using the expression vector pcDNA3.1-LTRPC2 obtained in Example 1 and a reagent for transfection (LIPOFECTAMINE 2000; manufactured by Invitrogen), transfection of a human fetal kidney-derived HEK 293 cell was carried out to induce expression of the human LTRPC2 protein. In this case, the aforementioned operation was carried out in accordance with the protocol attached to the aforementioned reagent for transfection and the known method (reference 1).

Example 10 Induction of Cell Death by Human LTRPC2 Protein

[0128] The transfected cells obtained in Example 8 were inoculated in 4×104 cells/well portions into a 96 well plate (manufactured by Asahi TechnoGlass), cultured overnight and then incubated at room temperature for 2 hours using a cell culture medium containing 0.001% in final concentration of H₂O₂. After washing with physiological saline, they were cultured for 4 hours by adding the cell culture medium. After removing the medium, alamaBlue Assay (provided by Bioscience) was carried out in order to judge life or death of the cells. According to this operation, life or death of the cells can be judged by adding a reagent which emits fluorescence by an oxidation reduction reaction in the cells and measuring the resulting fluorescence intensity. In this connection, the experimental procedure was carried out in accordance with the protocol attached to the reagent for the aforementioned alamaBlue Assay. The reagent for alamaBlue Assay was added to the stimulated cells, the mixture was incubated for additional 1 hour, and then the fluorescence intensity was measured. In this connection, the same operation was carried out as a control using cells transfected with pcDNA3.1 vector alone which does not contain LTRPC2. As a result, the fluorescence intensity was significantly reduced (reduction by 47.5%) in the cells in which LTRPC2 was expressed, in comparison with the cells in which the vector alone was expressed. This shows that a cell death occurred via LTRPC2 by the H₂O₂ stimulation, and surviving cells were reduced as a result. It was able to confirm based on this result that the human LTRPC2 protein accelerates the cell death by H₂O₂ stimulation. In addition, since it has been revealed by the aforementioned result that LTRPC2 is activated by the H₂O₂ stimulation, it is evident also from the result of this Example that the LTRPC2 protein has a function to induce cell death.

Example 11 Isolation of Gene Coding for Mouse LTRPC2 Protein

[0129] A complete length cDNA coding for a mouse LTRPC2 protein consisting of the amino acid sequence represented by SEQ ID NO:14 (to be referred simply to as “mouse LTRPC2 protein” in each of the following examples) was obtained by RT-PCR using 10 ng of a mouse brain mRNA (manufactured by Clontech) as the temperate, by the same techniques of Example 1 and Example 2. The PCR was carried out using an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:15 as the sense primer, and an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:16 as the antisense primer, and the PCR cycle was carried out under the same condition of Example 2. As a result, a DNA fragment of about 4.7 kbp was amplified. When this DNA fragment was cloned into the pCR-TOPO vector and nucleotide sequence of the thus obtained clone pCR-TOPO-mouse LTRPC2 was analyzed, the sequence represented by SEQ ID NO:13 was obtained. The nucleotide sequence represented by SEQ ID NO:13 has an open reading frame comprising 4,524 base pairs (a sequence comprising bases of from the 36th to 4,559th positions in the nucleotide sequence represented by SEQ ID NO:13). Amino acid sequence deduced from the aforementioned open reading frame was the amino acid sequence represented by SEQ ID NO:14 comprising 1,507 amino acid residues. The amino acid sequence represented by SEQ ID NO:14 has a homology of 84% with the amino acid sequence represented by SEQ ID NO:2 (human LTRPC2 protein) and that of 94% with the amino acid sequence represented by SEQ ID NO:4 (rat LTRPC2 protein). In this connection, the aforementioned numerical values of homology are values obtained by the aforementioned BLAST program.

Example 12 Expression Analysis of Mouse LTRPC2 Gene in Rheumatoid Arthritis Model Animal

[0130] In order to carry out expression analysis of LTRPC2 gene in rheumatoid arthritis, a mouse collagen-induced arthritis model was prepared as a model of rheumatoid arthritis, and changes in the expression of mouse LTRPC2 gene in this mouse were analyzed.

[0131] Preparation of the mouse collagen-induced arthritis model was carried out by the following method. A 150 μg portion of type 2 collagen was injected into a mouse joint region, the animal was fed for 3 weeks, and then injection of the same amount of collagen was carried out. Subsequently, 5 weeks of feeding was carried out and then the joint region was excised by carrying out dissection. In this case, it was confirmed that damages (chondroclasis and osteoclasis) similar to the case of rheumatoid arthritis patients were formed in the excised mouse joint. This mouse joint was frozen and pulverized, and then mRNA was extracted using ISOGEN reagent (manufactured by Nippon Gene). In this connection, mRNA was also extracted as a control from a joint of a normal mouse without the treatment.

[0132] In order to analyze changes in the expression of mouse LTRPC2 gene in the thus obtained joint of mouse collagen-induced arthritis model, real time PCR was carried out using PRISM 7900 (manufactured by Applied Biosystems). By carrying out real time PCR, mouse LTRPC2 gene contained in mRNA can be quantified and measured.

[0133] The thus obtained mRNA was subjected to a DNase treatment and then to reverse transcription using the kit for reverse transcription reaction, thereby obtaining a single-stranded cDNA. Using this single-stranded cDNA as the template, PCR was carried out using a fluorescence reagent SYBR Green PCR Core Reagents Kit (manufactured by Applied Biosystems). The aforementioned PCR was carried out using an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:17 as the sense primer, and an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:18 as the antisense primer, and firstly carrying out thermal denaturation at 95° C. (10 minutes) and then repeating a cycle of 95° C. (15 seconds)/59° C. (1 minute) 45 times. These primers are sequences specific for the mouse LTRPC2 gene, comprising respective sequences of from the 3,763rd to 3,780th positions and from the 3,813rd to 3,830th positions in the nucleotide sequence represented by SEQ ID NO:13.

[0134] As a result, expressed amount of the mouse LTRPC2 gene was increased in the mouse collagen-induced arthritis model by a factor of about 15 times in comparison with the untreated normal mouse. It was revealed from this result that the mouse LTRPC2 gene is taking an important role in rheumatoid arthritis.

Example 13 Expression Distribution of Mouse LTRPC2 Gene

[0135] Expression distribution of mouse LTRPC2 gene in mouse tissues was analyzed by real time PCR by the same method of Example 12 using PRISM 7900 (manufactured by Applied Biosystems). A 5 ng portion of each of mRNA preparations (manufactured by Clontech) derive from respective mouse tissues (brain, heart, kidney, liver, lung, pancreas, skeletal muscle, smooth muscle, spleen and testis) was subjected to a DNase treatment and then to reverse transcription using the kit for reverse transcription reaction, thereby obtaining a single-stranded cDNA. Using this single-stranded cDNA as the template, PCR was carried out. As a result, amplification was detected in all of the tissues with the brain and spleen as the center. It was revealed from this that the mRNA of mouse LTRPC2 is expressed in each of the aforementioned tissues. In addition, it was revealed based on this result that the mRNA of mouse LTRPC2 is expressed in tissues which have been reported to be related to diseases whose cause is a cell death accompanied by the PARP activation.

Example 14 Isolation of Gene Coding for PARP-1 Dominant Negative Mutant and Construction of Expression Vector

[0136] A sequence of from the 1st to 374th positions of a human PARP-1 complete length amino acid sequence (Genebank accession No: XP-037273) is a DNA binding region, and it is known that when this DNA binding region alone is co-expressed wild type PARP-1, they compete for the binding to DNA. It is known that the binding ratio of wild type PARP-1 to DNA is reduced as the result, thus causing inhibition of the poly(ADP-ribosyl)ation of activated PARP-1 to DNA and inhibition of the induction of cell death (dominant negative effect). Thus, it has been revealed that the DNA binding region alone of PARP-1 functions as a dominant negative mutant protein which shows the dominant negative effect for PARP-1 (Kupper, J. H., de, Murcia, G. and Burkle, A., J. Biol. Chem., 265, 18721-18724, 1990).

[0137] A complete length cDNA coding for a human PARP-1 dominant negative mutant protein comprising the aforementioned region, namely the amino acid sequence represented by SEQ ID NO:20 (to be referred simply to as “PARP-1 dominant negative mutant” in each of the following examples) was obtained by RT-PCR using a human spleen mRNA as the temperate. Firstly, a single-stranded cDNA was synthesized by carrying out reverse transcription of the human spleen mRNA (10 ng) using the kit for reverse transcription reaction. Using this single-stranded cDNA as the template, PCR was carried out by a hot start method using a Taq DNA polymerase (LA Taq DNA polymerase; manufactured by Takara Shuzo). The aforementioned PCR was carried out using an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:21 as the sense primer, and an oligonucleotide comprising the nucleotide sequence represented by SEQ ID NO:22 as the antisense primer, and firstly carrying out thermal denaturation at 98° C. (1 minute) and then repeating a cycle of 98° C. (15 seconds)/65° C. (30 seconds)/72° C. (6 minutes) 35 times. As a result, a DNA fragment of about 1.2 kbp was amplified. This DNA fragment was cloned into the pCR-TOPO vector using the cloning kit. An insert (cDNA coding for the PARP-1 dominant negative mutant) alone was isolated by digesting the thus obtained plasmid DNA with a restriction enzyme EcoRI and then cloned using a pcDNA3.1(+) plasmid (manufactured by Invitrogen). When nucleotide sequence of the thus obtained clone pcDNA3.1-PARPt was analyzed by the dideoxy terminator method using a DNA sequencer (ABI 3700 DNA Sequencer; manufactured by Applied Biosystems), the sequence represented by SEQ ID NO:19 was obtained. The sequence represented by SEQ ID NO:19 encoded the PARP-1 dominant negative mutant.

Example 15 Inhibition of Activation of Human LTRPC2 Protein by PARP-1 Dominant Negative Mutant

[0138] In order to examine influence of the PARP-1 dominant negative mutant upon the channel activity of human LTRPC2 protein, expression of the aforementioned protein was induced in an animal cell. Using the expression vectors pcDNA3.1-LTRPC2 and pcDNA3.1-PARPt obtained in Example 1 and Example 14 and a reagent for transfection (LIPOFECTAMINE 2000; manufactured by Invitrogen), transfection of a Chinese hamster ovary-derived CHO dhfr⁻ cell was carried out to induce expression of the human LTRPC2 protein and PARP-1 dominant negative mutant. In this case, the aforementioned operation was carried out in accordance with the protocol attached to the aforementioned reagent for transfection and the known method (reference 1).

[0139] Activation of LTRPC2 in the thus obtained transformed cells (1.6×10⁵ cells) was measured using a method measuring efflux of Rb⁺ ion. The method was carried out in the same manner as in Example 6. In this case, however, H₂O₂ (final concentration=0.06%) was used as the PARP activator, and cells in which the LTRPC2 protein alone obtained in Example 5 was expressed were used as the control.

[0140] As a result of the measurement, the residual activity of ⁸⁶Rb⁺ in the cells in which the PARP-1 dominant negative mutant was expressed was significantly increased in comparison with the control cells (cells in which the PARP-1 dominant negative mutant was not expressed).

[0141] This shows that the PARP activity was inhibited by the PARP-1 dominant negative mutant, and as the result, activation of the human LTRPC2 protein was inhibited and discharge of the intracellular ⁸⁶Rb⁺ into the extracellular moiety was reduced.

[0142] In addition, activation of PARP in this case was examined using the method of Example 8. However, H₂O₂ (final concentration=0.06%) was used as the PARP activator, and cells in which the LTRPC2 protein alone obtained in Example 5 was expressed were used as the control. As a result of the measurement, the ³H radioactivity in the cells in which the PARP-1 dominant negative mutant was expressed was reduced to 67% in comparison with the control cells.

[0143] It was revealed based on these results that the activation of human LTRPC2 protein by H₂O₂ is inhibited by the PARP-1 dominant negative mutant. In addition to the results obtained by using PARP inhibitors (Example 7), it was confirmed also from the results obtained using the PARP-1 dominant negative mutant (this Example) that the LTRPC2 activation is inhibited by the reduction of PARP activity, and the activity of LTRPC2 therefore is controlled by PARP.

Example 16 Screening of Human LTRPC2 Protein Inhibitor

[0144] Screening was carried out on a compound capable of inhibiting the ion channel activity of human LTRPC2 protein.

[0145] The transfected cells obtained in Example 5 (1.6×105 cells) were incubated at 37° C. for 24 hours in the presence of ⁸⁶RbCl (1 μCi/ml) to effect incorporation of ⁸⁶Rb⁺ into the cells and then washed with physiological saline to remove the ⁸⁶Rb⁺ which was not incorporated into the cells. The thus obtained cells were incubated at room temperature for 30 minutes in physiological saline supplemented with each of various compounds (final concentration=10 μmol/liter) in the presence of H₂O₂ (final concentration=0.06%). In this connection, the same operation was carried out as a control without adding the compound in the presence of H₂O₂.

[0146] The respective cells were washed with physiological saline, and then radioactivity of the ⁸⁶Rb⁺ remained in the cells was measured. A compound showing a significantly high residual activity as the thus obtained radioactivity, in comparison with the radioactivity of the control cells (cells to which H₂O₂ alone was added), is a compound which inhibits the channel activity of human LTRPC2 protein. This shows that ⁸⁶Rb⁺ in the cells was not effluxed into the extracellular moiety caused by the inhibition of the activation of human LTRPC2 protein induced by the added compound, or the efflux was reduced.

[0147] Since the compounds found in the above are obtained using, as the index, efflux of ⁸⁶Rb⁺ into the extracellular moiety accompanied by the activation of human LTRPC2 protein, the human LTRPC2 protein inhibition activity is not directly detected. More illustratively, a compound showing inhibition activity of PARP contained inside the cells also inhibits activation of the human LTRPC2 protein and inhibits efflux of ⁸⁶Rb⁺ into the extracellular moiety as a result. Accordingly, examination was further carried out on the PARP inhibition activity of the compounds obtained in the aforementioned process.

[0148] The transfected cells obtained in Example 5 were incubated at room temperature for 30 minutes in physiological saline supplemented with each of various compounds (final concentration=10 μmol/liter) in the presence of H₂O₂ (final concentration=0.06%). In this connection, the same operation was carried out as a control in the presence of H₂O₂ without adding the compound. Next, the cells after removal of the reaction solution were mixed with 0.2 nCi/μl in final concentration of ³H-NAD and incubated at 37° C. for 40 minutes. Subsequently, the reaction was stopped by adding TCA to the cells to a final concentration of 10% and incubating the mixture at 4° C. for 30 minutes. Thereafter, the un-incorporated ³H-NAD was removed by washing the cells twice with 5% TCA. The thus washed cells were lysed with a solution containing 2% SDS and 0.1% NaOH, and then the ³H radioactivity contained in the cells was measured.

[0149] As a result, a compound showing a residual activity similar to the residual radioactivity of the control cells (cells to which H₂O₂ alone was added) was selected. This shows that the added compound is not inhibiting the PARP activity.

[0150] As a result of these examinations, a compound which inhibited efflux of ⁸⁶Rb⁺ into the extracellular moiety accompanied by the activation of human LTRPC2 protein but did not inhibit the intracellular PARP activity at the same time was selected. It is considered that this compound is directly inhibiting the activation of human LTRPC2 protein.

[0151] Next, in order to verify that the thus found compound is directly inhibiting the human LTRPC2 protein, its influence upon the ion channel activity of human LTRPC2 protein was examined using a technique of electrophysiology. Illustratively, the whole cell current which is generated when ADP ribose (500 μM in final concentration) is administered inside the cells was measured by membrane potential-clamped the transfected cells obtained in the aforementioned Example 5 by the whole cell membrane potential-clamped (whole-cell voltage-clamp) method. A solution containing 145 mmol/L NaCl, 5 mmol/L KCl, 2 mmol/L CaCl₂, 2 mmol/L MgCl₂ and 10 mmol/L HEPES-Na (pH 7.4) was used as the extracellular solution, and a solution containing 150 mmol/L CsCl, 5 mmol/L MgCl₂ and 10 mmol/L HEPES-Cs (pH 7.2) was used as the intracellular solution.

[0152] In this case, change in the whole cell current induced by ADP ribose was measured by adding the compound found by the aforementioned process simultaneously with the ADP ribose administration or at the time of the pretreatment. In that case, a compound which reduces change in the whole cell current in comparison with the case of the addition of ADP ribose alone, or completely inhibits induction thereof, is selected. This shows that the added compound directly inhibited the channel activity of human LTRPC2 protein.

[0153] By carrying out these examinations, it is possible to find out a compound capable of directly inhibiting the human LTRPC2 protein.

Example 17 Expression of Human LTRPC2 Protein in Pancreatic Cell and Acceleration of Cell Death of Type I Diabetes Mellitus by Human LTRPC2 Protein

[0154] Function of human LTRPC2 protein in pancreas and participation of human LTRPC2 protein in cell death in a type I diabetes mellitus model were examined. Regarding the cell death of pancreatic cell in type I diabetes mellitus, a cell death by streptozotocin stimulation can be used as its model. In addition, it has been revealed also that PARP is concerned in the process of this cell death (Pieper, A. A. et al., Proc. Natl. Acad. Sci., 96, 3059-3064, 1999).

[0155] Using the expression vector pcDNA3.1-LTRPC2 obtained in Example 1 and a reagent for transfection (LIPOFECTAMINE; manufactured by Invitrogen), transfection of MIN6B cell derived from the β cell of the pancreatic islets of Langerhans was carried out to induce expression of the human LTRPC2 protein. In this case, the aforementioned operation was carried out in accordance with the protocol attached to the aforementioned reagent for transfection and the known method (reference 1).

[0156] The thus obtained transfected cells were inoculated in 4×10⁴ cells/well portions into a 96 well plate (manufactured by Asahi TechnoGlass), cultured overnight and then incubated at room temperature overnight using a cell culture medium containing 1 mM in final concentration of streptozotocin (manufactured by Sigma Aldrich). After removing the cell culture medium, an MTT Assay was carried out in order to judge life or death of the cells. According to this operation, life or death of the cells can be judged by making use of the reaction of developing blue color through the reduction of MTT into formazan by the respiratory enzyme system in mitochondria in the cells. After 2 hours of culturing by adding an MTT reagent (manufactured by Wako Pure Chemical Industries) to the stimulated cells, formazan was dissolved by adding DMSO to the resulting cells after removing the culture supernatant, and then its absorbance was measured using a spectrophotometer. In this case, the same operation was carried out as a control using cells transfected with the pcDNA3.1 vector alone which does not contain LTRPC2. As a result, the absorbance was significantly reduced (reduced to 93%) in the cells in which LTRPC2 was expressed, in comparison with the cells in which the vector alone was expressed. This shows that cell death was induced via LTRPC2 by the streptozotocin stimulation, and the number of surviving cells was reduced as the result. Based on this result, it was able to confirm that the human LTRPC2 protein accelerates cell death by streptozotocin stimulation. In addition, since the cell death by streptozotocin stimulation is a model of type I diabetes mellitus, it was revealed that the human LTRPC2 has a function to induce cell death by type I diabetes mellitus.

Industrial Applicability

[0157] According to the screening method of the present invention, it can screen a substance capable of inhibiting cell death induced by the activation of PARP, particularly a substance which is useful as a therapeutic agent and/or a preventive agent for a disease in which cell death induced by the activation of PARP is concerned (e.g., rheumatoid arthritis, neuronal death at the time of cerebral ischemia, cell death of the heart after myocardial infarction reperfusion, autoimmune destruction of β-cells of pancreatic islets of Langerhans, cell death after shock, or inflammatory reaction by immunocyte death). The screening system of the present invention can be constructed using the LTRPC2 of the present invention and the cell of the present invention.

[0158] Though the present invention has been described in the foregoing by specified embodiments, modifications and improvements obvious to those skilled in the art are included in the scope of the invention.

1 18 1 4738 DNA Homo sapiens CDS (22)..(4533) 1 agctggcgtg ggggtctcag a atg gag ccc tca gcc ctg agg aaa gct ggc 51 Met Glu Pro Ser Ala Leu Arg Lys Ala Gly 1 5 10 tcg gag cag gag gag ggc ttt gag ggg ctg ccc aga agg gtc act gac 99 Ser Glu Gln Glu Glu Gly Phe Glu Gly Leu Pro Arg Arg Val Thr Asp 15 20 25 ctg ggg atg gtc tcc aat ctc cgg cgc agc aac agc agc ctc ttc aag 147 Leu Gly Met Val Ser Asn Leu Arg Arg Ser Asn Ser Ser Leu Phe Lys 30 35 40 agc tgg agg cta cag tgc ccc ttc ggc aac aat gac aag caa gaa agc 195 Ser Trp Arg Leu Gln Cys Pro Phe Gly Asn Asn Asp Lys Gln Glu Ser 45 50 55 ctc agt tcg tgg att cct gaa aac atc aag aag aaa gaa tgc gtg tat 243 Leu Ser Ser Trp Ile Pro Glu Asn Ile Lys Lys Lys Glu Cys Val Tyr 60 65 70 ttt gtg gaa agt tcc aaa ctg tct gat gct ggg aag gtg gtg tgt cag 291 Phe Val Glu Ser Ser Lys Leu Ser Asp Ala Gly Lys Val Val Cys Gln 75 80 85 90 tgt ggc tac acg cat gag cag cac ttg gag gag gct acc aag ccc cac 339 Cys Gly Tyr Thr His Glu Gln His Leu Glu Glu Ala Thr Lys Pro His 95 100 105 acc ttc cag ggc aca cag tgg gac cca aag aaa cat gtc cag gag atg 387 Thr Phe Gln Gly Thr Gln Trp Asp Pro Lys Lys His Val Gln Glu Met 110 115 120 cca acc gat gcc ttt ggc gac atc gtc ttc acg ggc ctg agc cag aag 435 Pro Thr Asp Ala Phe Gly Asp Ile Val Phe Thr Gly Leu Ser Gln Lys 125 130 135 gtg aaa aag tac gtc cga gtc tcc cag gac acg ccc tcc agc gtg atc 483 Val Lys Lys Tyr Val Arg Val Ser Gln Asp Thr Pro Ser Ser Val Ile 140 145 150 tac cac ctc atg acc cag cac tgg ggg ctg gac gtc ccc aat ctc ttg 531 Tyr His Leu Met Thr Gln His Trp Gly Leu Asp Val Pro Asn Leu Leu 155 160 165 170 atc tcg gtg acc ggg ggg gcc aag aac ttc aac atg aag ccg cgg ctg 579 Ile Ser Val Thr Gly Gly Ala Lys Asn Phe Asn Met Lys Pro Arg Leu 175 180 185 aag agc att ttc cgc aga ggc ctg gtc aag gtg gct cag acc aca ggg 627 Lys Ser Ile Phe Arg Arg Gly Leu Val Lys Val Ala Gln Thr Thr Gly 190 195 200 gcc tgg atc atc aca ggg ggg tcc cac acc ggc gtc atg aag cag gta 675 Ala Trp Ile Ile Thr Gly Gly Ser His Thr Gly Val Met Lys Gln Val 205 210 215 ggc gag gcg gtg cgg gac ttc agc ctg agc agc agc tac aag gaa ggc 723 Gly Glu Ala Val Arg Asp Phe Ser Leu Ser Ser Ser Tyr Lys Glu Gly 220 225 230 gag ctc atc acc atc gga gtc gcc acc tgg ggc act gtc cac cgc cgc 771 Glu Leu Ile Thr Ile Gly Val Ala Thr Trp Gly Thr Val His Arg Arg 235 240 245 250 gag ggc ctg atc cat ccc acg ggc agc ttc ccc gcc gag tac ata ctg 819 Glu Gly Leu Ile His Pro Thr Gly Ser Phe Pro Ala Glu Tyr Ile Leu 255 260 265 gat gag gat ggc caa ggg aac ctg acc tgc cta gac agc aac cac tct 867 Asp Glu Asp Gly Gln Gly Asn Leu Thr Cys Leu Asp Ser Asn His Ser 270 275 280 cac ttc atc ctc gtg gac gac ggg acc cac ggc cag tac ggg gtg gag 915 His Phe Ile Leu Val Asp Asp Gly Thr His Gly Gln Tyr Gly Val Glu 285 290 295 att cct ctg agg acc agg ctg gag aag ttc ata tcg gag cag acc aag 963 Ile Pro Leu Arg Thr Arg Leu Glu Lys Phe Ile Ser Glu Gln Thr Lys 300 305 310 gaa aga gga ggt gtg gcc atc aag atc ccc atc gtg tgc gtg gtg ctg 1011 Glu Arg Gly Gly Val Ala Ile Lys Ile Pro Ile Val Cys Val Val Leu 315 320 325 330 gag ggc ggc ccg ggc acg ttg cac acc atc gac aac gcc acc acc aac 1059 Glu Gly Gly Pro Gly Thr Leu His Thr Ile Asp Asn Ala Thr Thr Asn 335 340 345 ggc acc ccc tgt gtg gtt gtg gag ggc tcg ggc cgc gtg gcc gac gtc 1107 Gly Thr Pro Cys Val Val Val Glu Gly Ser Gly Arg Val Ala Asp Val 350 355 360 att gcc cag gtg gcc aac ctg cct gtc tcg gac atc act atc tcc ctg 1155 Ile Ala Gln Val Ala Asn Leu Pro Val Ser Asp Ile Thr Ile Ser Leu 365 370 375 atc cag cag aaa ctg agc gtg ttc ttc cag gag atg ttt gag acc ttc 1203 Ile Gln Gln Lys Leu Ser Val Phe Phe Gln Glu Met Phe Glu Thr Phe 380 385 390 acg gaa agc agg att gtc gag tgg acc aaa aag atc caa gat att gtc 1251 Thr Glu Ser Arg Ile Val Glu Trp Thr Lys Lys Ile Gln Asp Ile Val 395 400 405 410 cgg agg cgg cag ctg ctg act gtc ttc cgg gaa ggc aag gat ggt cag 1299 Arg Arg Arg Gln Leu Leu Thr Val Phe Arg Glu Gly Lys Asp Gly Gln 415 420 425 cag gac gtg gat gtg gcc atc ttg cag gcc ttg ctg aaa gcc tca cgg 1347 Gln Asp Val Asp Val Ala Ile Leu Gln Ala Leu Leu Lys Ala Ser Arg 430 435 440 agc caa gac cac ttt ggc cac gag aac tgg gac cac cag ctg aaa ctg 1395 Ser Gln Asp His Phe Gly His Glu Asn Trp Asp His Gln Leu Lys Leu 445 450 455 gca gtg gca tgg aat cgc gtg gac att gcc cgc agt gag atc ttc atg 1443 Ala Val Ala Trp Asn Arg Val Asp Ile Ala Arg Ser Glu Ile Phe Met 460 465 470 gat gag tgg cag tgg aag cct tca gat ctg cac ccc acg atg aca gct 1491 Asp Glu Trp Gln Trp Lys Pro Ser Asp Leu His Pro Thr Met Thr Ala 475 480 485 490 gca ctc atc tcc aac aag cct gag ttt gtg aag ctc ttc ctg gaa aac 1539 Ala Leu Ile Ser Asn Lys Pro Glu Phe Val Lys Leu Phe Leu Glu Asn 495 500 505 ggg gtg cag ctg aag gag ttt gtc acc tgg gac acc ttg ctc tac ctg 1587 Gly Val Gln Leu Lys Glu Phe Val Thr Trp Asp Thr Leu Leu Tyr Leu 510 515 520 tac gag aac ctg gac ccc tcc tgc ctg ttc cac agc aag ctg caa aag 1635 Tyr Glu Asn Leu Asp Pro Ser Cys Leu Phe His Ser Lys Leu Gln Lys 525 530 535 gtg ctg gtg gag gat ccc gag cgc ccg gct tgc gcg ccc gcg gcg ccc 1683 Val Leu Val Glu Asp Pro Glu Arg Pro Ala Cys Ala Pro Ala Ala Pro 540 545 550 cgc ctg cag atg cac cac gtg gcc cag gtg ctg cgg gag ctg ctg ggg 1731 Arg Leu Gln Met His His Val Ala Gln Val Leu Arg Glu Leu Leu Gly 555 560 565 570 gac ttc acg cag ccg ctt tat ccc cgg ccc cgg cac aac gac cgg ctg 1779 Asp Phe Thr Gln Pro Leu Tyr Pro Arg Pro Arg His Asn Asp Arg Leu 575 580 585 cgg ctc ctg ctg ccc gtt ccc cac gtc aag ctc aac gtg cag gga gtg 1827 Arg Leu Leu Leu Pro Val Pro His Val Lys Leu Asn Val Gln Gly Val 590 595 600 agc ctc cgg tcc ctc tac aag cgt tcc tca ggc cat gtg acc ttc acc 1875 Ser Leu Arg Ser Leu Tyr Lys Arg Ser Ser Gly His Val Thr Phe Thr 605 610 615 atg gac ccc atc cgt gac ctt ctc att tgg gcc att gtc cag aac cgt 1923 Met Asp Pro Ile Arg Asp Leu Leu Ile Trp Ala Ile Val Gln Asn Arg 620 625 630 cgg gag ctg gca gga atc atc tgg gct cag agc cag gac tgc atc gca 1971 Arg Glu Leu Ala Gly Ile Ile Trp Ala Gln Ser Gln Asp Cys Ile Ala 635 640 645 650 gcg gcc ttg gcc tgc agc aag atc ctg aag gaa ctg tcc aag gag gag 2019 Ala Ala Leu Ala Cys Ser Lys Ile Leu Lys Glu Leu Ser Lys Glu Glu 655 660 665 gag gac acg gac agc tcg gag gag atg ctg gcg ctg gcg gag gag tat 2067 Glu Asp Thr Asp Ser Ser Glu Glu Met Leu Ala Leu Ala Glu Glu Tyr 670 675 680 gag cac aga gcc atc ggg gtc ttc acc gag tgc tac cgg aag gac gaa 2115 Glu His Arg Ala Ile Gly Val Phe Thr Glu Cys Tyr Arg Lys Asp Glu 685 690 695 gag aga gcc cag aaa ctg ctc acc cgc gtg tcc gag gcc tgg ggg aag 2163 Glu Arg Ala Gln Lys Leu Leu Thr Arg Val Ser Glu Ala Trp Gly Lys 700 705 710 acc acc tgc ctg cag ctc gcc ctg gag gcc aag gac atg aag ttt gtg 2211 Thr Thr Cys Leu Gln Leu Ala Leu Glu Ala Lys Asp Met Lys Phe Val 715 720 725 730 tct cac ggg ggc atc cag gcc ttc ctg acc aag gtg tgg tgg ggc cag 2259 Ser His Gly Gly Ile Gln Ala Phe Leu Thr Lys Val Trp Trp Gly Gln 735 740 745 ctc tcc gtg gac aat ggg ctg tgg cgt gtg acc ctg tgc atg ctg gcc 2307 Leu Ser Val Asp Asn Gly Leu Trp Arg Val Thr Leu Cys Met Leu Ala 750 755 760 ttc ccg ctg ctc ctc acc ggc ctc atc tcc ttc agg gag aag agg ctg 2355 Phe Pro Leu Leu Leu Thr Gly Leu Ile Ser Phe Arg Glu Lys Arg Leu 765 770 775 cag gat gtg ggc acc ccc gcg gcc cgc gcc cgt gcc ttc ttc acc gca 2403 Gln Asp Val Gly Thr Pro Ala Ala Arg Ala Arg Ala Phe Phe Thr Ala 780 785 790 ccc gtg gtg gtc ttc cac ctg aac atc ctc tcc tac ttc gcc ttc ctc 2451 Pro Val Val Val Phe His Leu Asn Ile Leu Ser Tyr Phe Ala Phe Leu 795 800 805 810 tgc ctg ttc gcc tac gtg ctc atg gtg gac ttc cag cct gtg ccc tcc 2499 Cys Leu Phe Ala Tyr Val Leu Met Val Asp Phe Gln Pro Val Pro Ser 815 820 825 tgg tgc gag tgt gcc atc tac ctc tgg ctc ttc tcc ttg gtg tgc gag 2547 Trp Cys Glu Cys Ala Ile Tyr Leu Trp Leu Phe Ser Leu Val Cys Glu 830 835 840 gag atg cgg cag ctc ttc tat gac cct gac gag tgc ggg ctg atg aag 2595 Glu Met Arg Gln Leu Phe Tyr Asp Pro Asp Glu Cys Gly Leu Met Lys 845 850 855 aag gca gcc ttg tac ttc agt gac ttc tgg aat aag ctg gac gtc ggc 2643 Lys Ala Ala Leu Tyr Phe Ser Asp Phe Trp Asn Lys Leu Asp Val Gly 860 865 870 gca atc ttg ctc ttc gtg gca ggg ctg acc tgc agg ctc atc ccg gcg 2691 Ala Ile Leu Leu Phe Val Ala Gly Leu Thr Cys Arg Leu Ile Pro Ala 875 880 885 890 acg ctg tac ccc ggg cgc gtc atc ctc tct ctg gac ttc atc ctg ttc 2739 Thr Leu Tyr Pro Gly Arg Val Ile Leu Ser Leu Asp Phe Ile Leu Phe 895 900 905 tgc ctc cgg ctc atg cac att ttt acc atc agt aag acg ctg ggg ccc 2787 Cys Leu Arg Leu Met His Ile Phe Thr Ile Ser Lys Thr Leu Gly Pro 910 915 920 aag atc atc att gtg aag cgg atg atg aag gac gtc ttc ttc ttc ctc 2835 Lys Ile Ile Ile Val Lys Arg Met Met Lys Asp Val Phe Phe Phe Leu 925 930 935 ttc ctg ctg gct gtg tgg gtg gtg tcc ttc ggg gtg gcc aag cag gcc 2883 Phe Leu Leu Ala Val Trp Val Val Ser Phe Gly Val Ala Lys Gln Ala 940 945 950 atc ctc atc cac aac gag cgc cgg gtg gac tgg ctg ttc cga ggg gcc 2931 Ile Leu Ile His Asn Glu Arg Arg Val Asp Trp Leu Phe Arg Gly Ala 955 960 965 970 gtc tac cac tcc tac ctc acc atc ttc ggg cag atc ccg ggc tac atc 2979 Val Tyr His Ser Tyr Leu Thr Ile Phe Gly Gln Ile Pro Gly Tyr Ile 975 980 985 gac ggt gtg aac ttc aac ccg gag cac tgc agc ccc aat ggc acc gac 3027 Asp Gly Val Asn Phe Asn Pro Glu His Cys Ser Pro Asn Gly Thr Asp 990 995 1000 ccc tac aag cct aag tgc ccc gag agc gac gcg acg cag cag agg ccg 3075 Pro Tyr Lys Pro Lys Cys Pro Glu Ser Asp Ala Thr Gln Gln Arg Pro 1005 1010 1015 gcc ttc cct gag tgg ctg acg gtc ctc cta ctc tgc ctc tac ctg ctc 3123 Ala Phe Pro Glu Trp Leu Thr Val Leu Leu Leu Cys Leu Tyr Leu Leu 1020 1025 1030 ttc acc aac atc ctg ctg ctc aac ctc ctc atc gcc atg ttc aac tac 3171 Phe Thr Asn Ile Leu Leu Leu Asn Leu Leu Ile Ala Met Phe Asn Tyr 1035 1040 1045 1050 acc ttc cag cag gtg cag gag cac acg gac cag att tgg aag ttc cag 3219 Thr Phe Gln Gln Val Gln Glu His Thr Asp Gln Ile Trp Lys Phe Gln 1055 1060 1065 cgc cat gac ctg atc gag gag tac cac ggc cgc ccc gcc gcg ccg ccc 3267 Arg His Asp Leu Ile Glu Glu Tyr His Gly Arg Pro Ala Ala Pro Pro 1070 1075 1080 ccc ttc atc ctc ctc agc cac ctg cag ctc ttc atc aag agg gtg gtc 3315 Pro Phe Ile Leu Leu Ser His Leu Gln Leu Phe Ile Lys Arg Val Val 1085 1090 1095 ctg aag act ccg gcc aag agg cac aag cag ctc aag aac aag ctg gag 3363 Leu Lys Thr Pro Ala Lys Arg His Lys Gln Leu Lys Asn Lys Leu Glu 1100 1105 1110 aag aac gag gag gcg gcc ctg cta tcc tgg gag atc tac ctg aag gag 3411 Lys Asn Glu Glu Ala Ala Leu Leu Ser Trp Glu Ile Tyr Leu Lys Glu 1115 1120 1125 1130 aac tac ctc cag aac cga cag ttc cag caa aag cag cgg ccc gag cag 3459 Asn Tyr Leu Gln Asn Arg Gln Phe Gln Gln Lys Gln Arg Pro Glu Gln 1135 1140 1145 aag atc gag gac atc agc aat aag gtt gac gcc atg gtg gac ctg ctg 3507 Lys Ile Glu Asp Ile Ser Asn Lys Val Asp Ala Met Val Asp Leu Leu 1150 1155 1160 gac ctg gac cca ctg aag agg tcg ggc tcc atg gag cag agg ttg gcc 3555 Asp Leu Asp Pro Leu Lys Arg Ser Gly Ser Met Glu Gln Arg Leu Ala 1165 1170 1175 tcc ctg gag gag cag gtg gcc cag aca gcc cga gcc ctg cac tgg atc 3603 Ser Leu Glu Glu Gln Val Ala Gln Thr Ala Arg Ala Leu His Trp Ile 1180 1185 1190 gtg agg acg ctg cgg gcc agc ggc ttc agc tcg gag gcg gac gtc ccc 3651 Val Arg Thr Leu Arg Ala Ser Gly Phe Ser Ser Glu Ala Asp Val Pro 1195 1200 1205 1210 act ctg gcc tcc cag aag gcc gcg gag gag ccg gat gct gag ccg gga 3699 Thr Leu Ala Ser Gln Lys Ala Ala Glu Glu Pro Asp Ala Glu Pro Gly 1215 1220 1225 ggc agg aag aag acg gag gag ccg ggc gac agc tac cac gtg aat gcc 3747 Gly Arg Lys Lys Thr Glu Glu Pro Gly Asp Ser Tyr His Val Asn Ala 1230 1235 1240 cgg cac ctc ctc tac ccc aac tgc cct gtc acg cgc ttc ccc gtg ccc 3795 Arg His Leu Leu Tyr Pro Asn Cys Pro Val Thr Arg Phe Pro Val Pro 1245 1250 1255 aac gag aag gtg ccc tgg gag acg gag ttc ctg atc tat gac cca ccc 3843 Asn Glu Lys Val Pro Trp Glu Thr Glu Phe Leu Ile Tyr Asp Pro Pro 1260 1265 1270 ttt tac acg gca gag agg aag gac gcg gcc gcc atg gac ccc atg gga 3891 Phe Tyr Thr Ala Glu Arg Lys Asp Ala Ala Ala Met Asp Pro Met Gly 1275 1280 1285 1290 gac acc ctg gag cca ctg tcc acg atc cag tac aac gtg gtg gat ggc 3939 Asp Thr Leu Glu Pro Leu Ser Thr Ile Gln Tyr Asn Val Val Asp Gly 1295 1300 1305 ctg agg gac cgc cgg agc ttc cac ggg ccg tac aca gtg cag gcc ggg 3987 Leu Arg Asp Arg Arg Ser Phe His Gly Pro Tyr Thr Val Gln Ala Gly 1310 1315 1320 ttg ccc ctg aac ccc atg ggc cgc aca gga ctg cgt ggg cgc ggg agc 4035 Leu Pro Leu Asn Pro Met Gly Arg Thr Gly Leu Arg Gly Arg Gly Ser 1325 1330 1335 ctc agc tgc ttc gga ccc aac cac acg ctg tac ccc atg gtc acg cgg 4083 Leu Ser Cys Phe Gly Pro Asn His Thr Leu Tyr Pro Met Val Thr Arg 1340 1345 1350 tgg agg cgg aac gag gat gga gcc atc tgc agg aag agc ata aag aag 4131 Trp Arg Arg Asn Glu Asp Gly Ala Ile Cys Arg Lys Ser Ile Lys Lys 1355 1360 1365 1370 atg ctg gaa gtg ctg gtg gtg aag ctc cct ctc tcc gag cac tgg gcc 4179 Met Leu Glu Val Leu Val Val Lys Leu Pro Leu Ser Glu His Trp Ala 1375 1380 1385 ctg cct ggg ggc tcc cgg gag cca ggg gag atg cta cct cgg aag ctg 4227 Leu Pro Gly Gly Ser Arg Glu Pro Gly Glu Met Leu Pro Arg Lys Leu 1390 1395 1400 aag cgg atc ctc cgg cag gag cac tgg ccg tct ttt gaa aac ttg ctg 4275 Lys Arg Ile Leu Arg Gln Glu His Trp Pro Ser Phe Glu Asn Leu Leu 1405 1410 1415 aag tgc ggc atg gag gtg tac aaa ggc tac atg gat gac ccg agg aac 4323 Lys Cys Gly Met Glu Val Tyr Lys Gly Tyr Met Asp Asp Pro Arg Asn 1420 1425 1430 acg gac aat gcc tgg atc gag acg gtg gcc gtc agc gtc cac ttc cag 4371 Thr Asp Asn Ala Trp Ile Glu Thr Val Ala Val Ser Val His Phe Gln 1435 1440 1445 1450 gac cag aat gac gtg gag ctg aac agg ctg aac tct aac ctg cac gcc 4419 Asp Gln Asn Asp Val Glu Leu Asn Arg Leu Asn Ser Asn Leu His Ala 1455 1460 1465 tgc gac tcg ggg gcc tcc atc cga tgg cag gtg gtg gac agg cgc atc 4467 Cys Asp Ser Gly Ala Ser Ile Arg Trp Gln Val Val Asp Arg Arg Ile 1470 1475 1480 cca ctc tat gcg aac cac aag acc ctc ctc cag aag gca gcc gct gag 4515 Pro Leu Tyr Ala Asn His Lys Thr Leu Leu Gln Lys Ala Ala Ala Glu 1485 1490 1495 ttc ggg gct cac tac tga ctgtgccctc aggctgggcg gctccagtcc 4563 Phe Gly Ala His Tyr 1500 atagacgttc cccccagaaa ccagggcttc tctctcctga gcctggccag gactcaggct 4623 gttcctgggc cctgcacatg atggggtttg gtggacccag tgcccctcac ggctgccgca 4683 agtctgctgc agatgacctc atgaactgga aggggtcaag gtgacccggg aggag 4738 2 1503 PRT Homo sapiens 2 Met Glu Pro Ser Ala Leu Arg Lys Ala Gly Ser Glu Gln Glu Glu Gly 1 5 10 15 Phe Glu Gly Leu Pro Arg Arg Val Thr Asp Leu Gly Met Val Ser Asn 20 25 30 Leu Arg Arg Ser Asn Ser Ser Leu Phe Lys Ser Trp Arg Leu Gln Cys 35 40 45 Pro Phe Gly Asn Asn Asp Lys Gln Glu Ser Leu Ser Ser Trp Ile Pro 50 55 60 Glu Asn Ile Lys Lys Lys Glu Cys Val Tyr Phe Val Glu Ser Ser Lys 65 70 75 80 Leu Ser Asp Ala Gly Lys Val Val Cys Gln Cys Gly Tyr Thr His Glu 85 90 95 Gln His Leu Glu Glu Ala Thr Lys Pro His Thr Phe Gln Gly Thr Gln 100 105 110 Trp Asp Pro Lys Lys His Val Gln Glu Met Pro Thr Asp Ala Phe Gly 115 120 125 Asp Ile Val Phe Thr Gly Leu Ser Gln Lys Val Lys Lys Tyr Val Arg 130 135 140 Val Ser Gln Asp Thr Pro Ser Ser Val Ile Tyr His Leu Met Thr Gln 145 150 155 160 His Trp Gly Leu Asp Val Pro Asn Leu Leu Ile Ser Val Thr Gly Gly 165 170 175 Ala Lys Asn Phe Asn Met Lys Pro Arg Leu Lys Ser Ile Phe Arg Arg 180 185 190 Gly Leu Val Lys Val Ala Gln Thr Thr Gly Ala Trp Ile Ile Thr Gly 195 200 205 Gly Ser His Thr Gly Val Met Lys Gln Val Gly Glu Ala Val Arg Asp 210 215 220 Phe Ser Leu Ser Ser Ser Tyr Lys Glu Gly Glu Leu Ile Thr Ile Gly 225 230 235 240 Val Ala Thr Trp Gly Thr Val His Arg Arg Glu Gly Leu Ile His Pro 245 250 255 Thr Gly Ser Phe Pro Ala Glu Tyr Ile Leu Asp Glu Asp Gly Gln Gly 260 265 270 Asn Leu Thr Cys Leu Asp Ser Asn His Ser His Phe Ile Leu Val Asp 275 280 285 Asp Gly Thr His Gly Gln Tyr Gly Val Glu Ile Pro Leu Arg Thr Arg 290 295 300 Leu Glu Lys Phe Ile Ser Glu Gln Thr Lys Glu Arg Gly Gly Val Ala 305 310 315 320 Ile Lys Ile Pro Ile Val Cys Val Val Leu Glu Gly Gly Pro Gly Thr 325 330 335 Leu His Thr Ile Asp Asn Ala Thr Thr Asn Gly Thr Pro Cys Val Val 340 345 350 Val Glu Gly Ser Gly Arg Val Ala Asp Val Ile Ala Gln Val Ala Asn 355 360 365 Leu Pro Val Ser Asp Ile Thr Ile Ser Leu Ile Gln Gln Lys Leu Ser 370 375 380 Val Phe Phe Gln Glu Met Phe Glu Thr Phe Thr Glu Ser Arg Ile Val 385 390 395 400 Glu Trp Thr Lys Lys Ile Gln Asp Ile Val Arg Arg Arg Gln Leu Leu 405 410 415 Thr Val Phe Arg Glu Gly Lys Asp Gly Gln Gln Asp Val Asp Val Ala 420 425 430 Ile Leu Gln Ala Leu Leu Lys Ala Ser Arg Ser Gln Asp His Phe Gly 435 440 445 His Glu Asn Trp Asp His Gln Leu Lys Leu Ala Val Ala Trp Asn Arg 450 455 460 Val Asp Ile Ala Arg Ser Glu Ile Phe Met Asp Glu Trp Gln Trp Lys 465 470 475 480 Pro Ser Asp Leu His Pro Thr Met Thr Ala Ala Leu Ile Ser Asn Lys 485 490 495 Pro Glu Phe Val Lys Leu Phe Leu Glu Asn Gly Val Gln Leu Lys Glu 500 505 510 Phe Val Thr Trp Asp Thr Leu Leu Tyr Leu Tyr Glu Asn Leu Asp Pro 515 520 525 Ser Cys Leu Phe His Ser Lys Leu Gln Lys Val Leu Val Glu Asp Pro 530 535 540 Glu Arg Pro Ala Cys Ala Pro Ala Ala Pro Arg Leu Gln Met His His 545 550 555 560 Val Ala Gln Val Leu Arg Glu Leu Leu Gly Asp Phe Thr Gln Pro Leu 565 570 575 Tyr Pro Arg Pro Arg His Asn Asp Arg Leu Arg Leu Leu Leu Pro Val 580 585 590 Pro His Val Lys Leu Asn Val Gln Gly Val Ser Leu Arg Ser Leu Tyr 595 600 605 Lys Arg Ser Ser Gly His Val Thr Phe Thr Met Asp Pro Ile Arg Asp 610 615 620 Leu Leu Ile Trp Ala Ile Val Gln Asn Arg Arg Glu Leu Ala Gly Ile 625 630 635 640 Ile Trp Ala Gln Ser Gln Asp Cys Ile Ala Ala Ala Leu Ala Cys Ser 645 650 655 Lys Ile Leu Lys Glu Leu Ser Lys Glu Glu Glu Asp Thr Asp Ser Ser 660 665 670 Glu Glu Met Leu Ala Leu Ala Glu Glu Tyr Glu His Arg Ala Ile Gly 675 680 685 Val Phe Thr Glu Cys Tyr Arg Lys Asp Glu Glu Arg Ala Gln Lys Leu 690 695 700 Leu Thr Arg Val Ser Glu Ala Trp Gly Lys Thr Thr Cys Leu Gln Leu 705 710 715 720 Ala Leu Glu Ala Lys Asp Met Lys Phe Val Ser His Gly Gly Ile Gln 725 730 735 Ala Phe Leu Thr Lys Val Trp Trp Gly Gln Leu Ser Val Asp Asn Gly 740 745 750 Leu Trp Arg Val Thr Leu Cys Met Leu Ala Phe Pro Leu Leu Leu Thr 755 760 765 Gly Leu Ile Ser Phe Arg Glu Lys Arg Leu Gln Asp Val Gly Thr Pro 770 775 780 Ala Ala Arg Ala Arg Ala Phe Phe Thr Ala Pro Val Val Val Phe His 785 790 795 800 Leu Asn Ile Leu Ser Tyr Phe Ala Phe Leu Cys Leu Phe Ala Tyr Val 805 810 815 Leu Met Val Asp Phe Gln Pro Val Pro Ser Trp Cys Glu Cys Ala Ile 820 825 830 Tyr Leu Trp Leu Phe Ser Leu Val Cys Glu Glu Met Arg Gln Leu Phe 835 840 845 Tyr Asp Pro Asp Glu Cys Gly Leu Met Lys Lys Ala Ala Leu Tyr Phe 850 855 860 Ser Asp Phe Trp Asn Lys Leu Asp Val Gly Ala Ile Leu Leu Phe Val 865 870 875 880 Ala Gly Leu Thr Cys Arg Leu Ile Pro Ala Thr Leu Tyr Pro Gly Arg 885 890 895 Val Ile Leu Ser Leu Asp Phe Ile Leu Phe Cys Leu Arg Leu Met His 900 905 910 Ile Phe Thr Ile Ser Lys Thr Leu Gly Pro Lys Ile Ile Ile Val Lys 915 920 925 Arg Met Met Lys Asp Val Phe Phe Phe Leu Phe Leu Leu Ala Val Trp 930 935 940 Val Val Ser Phe Gly Val Ala Lys Gln Ala Ile Leu Ile His Asn Glu 945 950 955 960 Arg Arg Val Asp Trp Leu Phe Arg Gly Ala Val Tyr His Ser Tyr Leu 965 970 975 Thr Ile Phe Gly Gln Ile Pro Gly Tyr Ile Asp Gly Val Asn Phe Asn 980 985 990 Pro Glu His Cys Ser Pro Asn Gly Thr Asp Pro Tyr Lys Pro Lys Cys 995 1000 1005 Pro Glu Ser Asp Ala Thr Gln Gln Arg Pro Ala Phe Pro Glu Trp Leu 1010 1015 1020 Thr Val Leu Leu Leu Cys Leu Tyr Leu Leu Phe Thr Asn Ile Leu Leu 1025 1030 1035 1040 Leu Asn Leu Leu Ile Ala Met Phe Asn Tyr Thr Phe Gln Gln Val Gln 1045 1050 1055 Glu His Thr Asp Gln Ile Trp Lys Phe Gln Arg His Asp Leu Ile Glu 1060 1065 1070 Glu Tyr His Gly Arg Pro Ala Ala Pro Pro Pro Phe Ile Leu Leu Ser 1075 1080 1085 His Leu Gln Leu Phe Ile Lys Arg Val Val Leu Lys Thr Pro Ala Lys 1090 1095 1100 Arg His Lys Gln Leu Lys Asn Lys Leu Glu Lys Asn Glu Glu Ala Ala 1105 1110 1115 1120 Leu Leu Ser Trp Glu Ile Tyr Leu Lys Glu Asn Tyr Leu Gln Asn Arg 1125 1130 1135 Gln Phe Gln Gln Lys Gln Arg Pro Glu Gln Lys Ile Glu Asp Ile Ser 1140 1145 1150 Asn Lys Val Asp Ala Met Val Asp Leu Leu Asp Leu Asp Pro Leu Lys 1155 1160 1165 Arg Ser Gly Ser Met Glu Gln Arg Leu Ala Ser Leu Glu Glu Gln Val 1170 1175 1180 Ala Gln Thr Ala Arg Ala Leu His Trp Ile Val Arg Thr Leu Arg Ala 1185 1190 1195 1200 Ser Gly Phe Ser Ser Glu Ala Asp Val Pro Thr Leu Ala Ser Gln Lys 1205 1210 1215 Ala Ala Glu Glu Pro Asp Ala Glu Pro Gly Gly Arg Lys Lys Thr Glu 1220 1225 1230 Glu Pro Gly Asp Ser Tyr His Val Asn Ala Arg His Leu Leu Tyr Pro 1235 1240 1245 Asn Cys Pro Val Thr Arg Phe Pro Val Pro Asn Glu Lys Val Pro Trp 1250 1255 1260 Glu Thr Glu Phe Leu Ile Tyr Asp Pro Pro Phe Tyr Thr Ala Glu Arg 1265 1270 1275 1280 Lys Asp Ala Ala Ala Met Asp Pro Met Gly Asp Thr Leu Glu Pro Leu 1285 1290 1295 Ser Thr Ile Gln Tyr Asn Val Val Asp Gly Leu Arg Asp Arg Arg Ser 1300 1305 1310 Phe His Gly Pro Tyr Thr Val Gln Ala Gly Leu Pro Leu Asn Pro Met 1315 1320 1325 Gly Arg Thr Gly Leu Arg Gly Arg Gly Ser Leu Ser Cys Phe Gly Pro 1330 1335 1340 Asn His Thr Leu Tyr Pro Met Val Thr Arg Trp Arg Arg Asn Glu Asp 1345 1350 1355 1360 Gly Ala Ile Cys Arg Lys Ser Ile Lys Lys Met Leu Glu Val Leu Val 1365 1370 1375 Val Lys Leu Pro Leu Ser Glu His Trp Ala Leu Pro Gly Gly Ser Arg 1380 1385 1390 Glu Pro Gly Glu Met Leu Pro Arg Lys Leu Lys Arg Ile Leu Arg Gln 1395 1400 1405 Glu His Trp Pro Ser Phe Glu Asn Leu Leu Lys Cys Gly Met Glu Val 1410 1415 1420 Tyr Lys Gly Tyr Met Asp Asp Pro Arg Asn Thr Asp Asn Ala Trp Ile 1425 1430 1435 1440 Glu Thr Val Ala Val Ser Val His Phe Gln Asp Gln Asn Asp Val Glu 1445 1450 1455 Leu Asn Arg Leu Asn Ser Asn Leu His Ala Cys Asp Ser Gly Ala Ser 1460 1465 1470 Ile Arg Trp Gln Val Val Asp Arg Arg Ile Pro Leu Tyr Ala Asn His 1475 1480 1485 Lys Thr Leu Leu Gln Lys Ala Ala Ala Glu Phe Gly Ala His Tyr 1490 1495 1500 3 4738 DNA Rattus sp. CDS (84)..(4610) 3 cccccaacct cacaaatgag aagagacatc cctgaaaggc atctagagat ctctctcctc 60 tggtggatct ggagccgtgg agg atg gag ccc ttg gac cag aga aga act gac 113 Met Glu Pro Leu Asp Gln Arg Arg Thr Asp 1 5 10 tct gat caa gag gag ggc ttt ggg gtg cag tcc cgg agg gcc act gat 161 Ser Asp Gln Glu Glu Gly Phe Gly Val Gln Ser Arg Arg Ala Thr Asp 15 20 25 ctg ggc atg gtc ccc aat ctc cga cga agc aat agc agt ctt tgc aag 209 Leu Gly Met Val Pro Asn Leu Arg Arg Ser Asn Ser Ser Leu Cys Lys 30 35 40 agc agg agg ctt ctg tgc tcc ttc agc agt gag aag caa gaa aac ctt 257 Ser Arg Arg Leu Leu Cys Ser Phe Ser Ser Glu Lys Gln Glu Asn Leu 45 50 55 agc tca tgg att ccc gag aac atc aag aag aag gaa tgt gtg tat ttc 305 Ser Ser Trp Ile Pro Glu Asn Ile Lys Lys Lys Glu Cys Val Tyr Phe 60 65 70 gtg gaa agt tcc aag ctc tcg gat gca ggg aag gta gtg tgt gag tgt 353 Val Glu Ser Ser Lys Leu Ser Asp Ala Gly Lys Val Val Cys Glu Cys 75 80 85 90 ggt tac acc cac gag cag cac att gaa gtg gcc atc aag cct cac acc 401 Gly Tyr Thr His Glu Gln His Ile Glu Val Ala Ile Lys Pro His Thr 95 100 105 ttc cag ggc aag gag tgg gac cca aag aaa cac gtc cat gag atg cct 449 Phe Gln Gly Lys Glu Trp Asp Pro Lys Lys His Val His Glu Met Pro 110 115 120 aca gat gcc ttt ggt gac att gtc ttc acc ggc ctg agc cag aaa gtg 497 Thr Asp Ala Phe Gly Asp Ile Val Phe Thr Gly Leu Ser Gln Lys Val 125 130 135 ggg aag tat gtc cga ctc tcc cag gac acg tcg tcc att gtc atc tac 545 Gly Lys Tyr Val Arg Leu Ser Gln Asp Thr Ser Ser Ile Val Ile Tyr 140 145 150 cag ctt atg aca cag cac tgg ggc ctg gat gtc ccc agc ctc ctc atc 593 Gln Leu Met Thr Gln His Trp Gly Leu Asp Val Pro Ser Leu Leu Ile 155 160 165 170 tct gtg acc ggt ggg gcc aag aac ttc aac atg aag ctg agg ttg aag 641 Ser Val Thr Gly Gly Ala Lys Asn Phe Asn Met Lys Leu Arg Leu Lys 175 180 185 agc atc ttc cgg aga ggc ctg gtt aag gtg gcc caa acc acg ggg gcc 689 Ser Ile Phe Arg Arg Gly Leu Val Lys Val Ala Gln Thr Thr Gly Ala 190 195 200 tgg atc atc act ggg ggt tcc cac acc ggt gtg atg aag cag gtg ggc 737 Trp Ile Ile Thr Gly Gly Ser His Thr Gly Val Met Lys Gln Val Gly 205 210 215 gag gcg gta cgg gac ttc agc cta agc agc agc tgc aaa gaa ggc gac 785 Glu Ala Val Arg Asp Phe Ser Leu Ser Ser Ser Cys Lys Glu Gly Asp 220 225 230 gtc atc acc atc ggc ata gcc acg tgg ggc acc atc cac aac cgt gag 833 Val Ile Thr Ile Gly Ile Ala Thr Trp Gly Thr Ile His Asn Arg Glu 235 240 245 250 gca ctg atc cat ccc atg gga ggc ttc ccc gct gag tac atg ctg gat 881 Ala Leu Ile His Pro Met Gly Gly Phe Pro Ala Glu Tyr Met Leu Asp 255 260 265 gag gaa ggc caa ggg aac ctg acc tgc ctg gac agc aac cac tcc cac 929 Glu Glu Gly Gln Gly Asn Leu Thr Cys Leu Asp Ser Asn His Ser His 270 275 280 ttc atc ctg gtg gat gat ggg acc cac ggg cag tat ggt gtg gag att 977 Phe Ile Leu Val Asp Asp Gly Thr His Gly Gln Tyr Gly Val Glu Ile 285 290 295 ccg ctg agg act aag ctg gag aag ttc ata tcg gag caa acg aag gaa 1025 Pro Leu Arg Thr Lys Leu Glu Lys Phe Ile Ser Glu Gln Thr Lys Glu 300 305 310 aga ggg ggt gtg gcc att aag atc ccc att gtc tgc gtg gtg ttg gag 1073 Arg Gly Gly Val Ala Ile Lys Ile Pro Ile Val Cys Val Val Leu Glu 315 320 325 330 ggt ggc cct ggc act ctg cat acc atc tac aac gcc atc acc aat ggc 1121 Gly Gly Pro Gly Thr Leu His Thr Ile Tyr Asn Ala Ile Thr Asn Gly 335 340 345 aca ccc tgc gtg ata gtg gag ggc tcc ggc cga gtg gct gac gtc atc 1169 Thr Pro Cys Val Ile Val Glu Gly Ser Gly Arg Val Ala Asp Val Ile 350 355 360 gct cag gtg gcc gct ctg ccc gtc tct gag atc acc atc tcc ctg atc 1217 Ala Gln Val Ala Ala Leu Pro Val Ser Glu Ile Thr Ile Ser Leu Ile 365 370 375 cag cag aag ctc agc gtc ttc ttc cag gag atg ttt gag act ttc acc 1265 Gln Gln Lys Leu Ser Val Phe Phe Gln Glu Met Phe Glu Thr Phe Thr 380 385 390 gaa aac cag att gtg gaa tgg acc aaa aag atc caa gat att gtc agg 1313 Glu Asn Gln Ile Val Glu Trp Thr Lys Lys Ile Gln Asp Ile Val Arg 395 400 405 410 agg cgg cag ctg ctg acg gtc ttc cgg gaa ggc aag gat ggt cag cag 1361 Arg Arg Gln Leu Leu Thr Val Phe Arg Glu Gly Lys Asp Gly Gln Gln 415 420 425 gat gtg gat gtt gcc att ctg caa gct tta ctg aaa gcc tct cga agc 1409 Asp Val Asp Val Ala Ile Leu Gln Ala Leu Leu Lys Ala Ser Arg Ser 430 435 440 caa gat cac ttc ggc cac gag aac tgg gac cat cag ctg aag ctg gcc 1457 Gln Asp His Phe Gly His Glu Asn Trp Asp His Gln Leu Lys Leu Ala 445 450 455 gtg gcc tgg aac cgt gtg gac atc gcc cgc agt gag atc ttc act gat 1505 Val Ala Trp Asn Arg Val Asp Ile Ala Arg Ser Glu Ile Phe Thr Asp 460 465 470 gag tgg cag tgg aag cct tca gac ctg cat ccc atg atg aca gct gcc 1553 Glu Trp Gln Trp Lys Pro Ser Asp Leu His Pro Met Met Thr Ala Ala 475 480 485 490 ctc atc tcc aac aag cct gag ttt gtg agg ctc ttt ctg gag aac ggg 1601 Leu Ile Ser Asn Lys Pro Glu Phe Val Arg Leu Phe Leu Glu Asn Gly 495 500 505 gtg cgg ctg aag gag ttt gtc acc tgg gat act ctt ctc tgc ctc tac 1649 Val Arg Leu Lys Glu Phe Val Thr Trp Asp Thr Leu Leu Cys Leu Tyr 510 515 520 gag aac ctg gag cca tcc tgc ctt ttc cac agc aag ctg cag aag gtg 1697 Glu Asn Leu Glu Pro Ser Cys Leu Phe His Ser Lys Leu Gln Lys Val 525 530 535 ctg gca gaa gag cat gaa cgc tta gcc tat gca tct gag aca ccc cgg 1745 Leu Ala Glu Glu His Glu Arg Leu Ala Tyr Ala Ser Glu Thr Pro Arg 540 545 550 ctg caa atg cac cac gtg gcc cag gtg ctg cgt gag ctc ctc gga gac 1793 Leu Gln Met His His Val Ala Gln Val Leu Arg Glu Leu Leu Gly Asp 555 560 565 570 tcc aca cag ctg ctg tat ccc cgg ccc cgg tac act gac cgg cca cgg 1841 Ser Thr Gln Leu Leu Tyr Pro Arg Pro Arg Tyr Thr Asp Arg Pro Arg 575 580 585 ctc tcg ctg ccc atg cca cac atc aaa ctc aac gtg caa gga gtg agc 1889 Leu Ser Leu Pro Met Pro His Ile Lys Leu Asn Val Gln Gly Val Ser 590 595 600 ctc cgg tct ctc tat aag cga tca aca ggc cac gtt acc ttc acc att 1937 Leu Arg Ser Leu Tyr Lys Arg Ser Thr Gly His Val Thr Phe Thr Ile 605 610 615 gac cca gtc cgc gat ctt ctc att tgg gcc atc atc cag aac cac agg 1985 Asp Pro Val Arg Asp Leu Leu Ile Trp Ala Ile Ile Gln Asn His Arg 620 625 630 gag ctg gcg ggc atc atc tgg gct cag agc cag gac tgc aca gca gcc 2033 Glu Leu Ala Gly Ile Ile Trp Ala Gln Ser Gln Asp Cys Thr Ala Ala 635 640 645 650 gca ctg gcc tgc agc aag atc ctg aag gag ctg tcc aag gag gag gaa 2081 Ala Leu Ala Cys Ser Lys Ile Leu Lys Glu Leu Ser Lys Glu Glu Glu 655 660 665 gat aca gac agc tct gag gag atg ctg gca ctc gcg gat gag ttt gag 2129 Asp Thr Asp Ser Ser Glu Glu Met Leu Ala Leu Ala Asp Glu Phe Glu 670 675 680 cat aga gct atc ggt gtc ttc acc gag tgc tac aga aag gat gag gaa 2177 His Arg Ala Ile Gly Val Phe Thr Glu Cys Tyr Arg Lys Asp Glu Glu 685 690 695 aga gcc cag aag ctg ctt gtc cgt gtg tct gag gcc tgg ggg aag acc 2225 Arg Ala Gln Lys Leu Leu Val Arg Val Ser Glu Ala Trp Gly Lys Thr 700 705 710 acc tgc ctg cag ctg gcc ctc gag gcc aag gac atg aaa ttc gtg tct 2273 Thr Cys Leu Gln Leu Ala Leu Glu Ala Lys Asp Met Lys Phe Val Ser 715 720 725 730 cac gga ggg atc cag gct ttc cta acg aag gtg tgg tgg ggt cag ctc 2321 His Gly Gly Ile Gln Ala Phe Leu Thr Lys Val Trp Trp Gly Gln Leu 735 740 745 tgc gtg gac aat ggc ctg tgg agg atc atc ctg tgc atg ctg gcc ttc 2369 Cys Val Asp Asn Gly Leu Trp Arg Ile Ile Leu Cys Met Leu Ala Phe 750 755 760 cct ctg ctc ttc acc ggc ttc atc tcc ttc agg gaa aag agg ctg cag 2417 Pro Leu Leu Phe Thr Gly Phe Ile Ser Phe Arg Glu Lys Arg Leu Gln 765 770 775 gca ctg tgc cgc ccg gcc cgc gtc cgc gcc ttc ttc aac gcg ccg gtg 2465 Ala Leu Cys Arg Pro Ala Arg Val Arg Ala Phe Phe Asn Ala Pro Val 780 785 790 gtc atc ttc tac ctc aat att ctc tcc tac ttt gcc ttc ctc tgc ctg 2513 Val Ile Phe Tyr Leu Asn Ile Leu Ser Tyr Phe Ala Phe Leu Cys Leu 795 800 805 810 ttt gcc tac gtg ctc atg gtg gac ttc cag ccc tca cca tcc tgg tgc 2561 Phe Ala Tyr Val Leu Met Val Asp Phe Gln Pro Ser Pro Ser Trp Cys 815 820 825 gag tac ctc atc tac ctg tgg ctc ttc tcc ctg gtg tgc gag gag aca 2609 Glu Tyr Leu Ile Tyr Leu Trp Leu Phe Ser Leu Val Cys Glu Glu Thr 830 835 840 cgg cag cta ttc tac gat ccc gat ggc tgc ggg ctc atg aag atg gcg 2657 Arg Gln Leu Phe Tyr Asp Pro Asp Gly Cys Gly Leu Met Lys Met Ala 845 850 855 tcc ctg tac ttc agt gac ttc tgg aac aaa ctg gac gtt ggg gcc att 2705 Ser Leu Tyr Phe Ser Asp Phe Trp Asn Lys Leu Asp Val Gly Ala Ile 860 865 870 ctg ctc ttt ata gca gga ctg acc tgc cga ctc atc cca gcg acg ctg 2753 Leu Leu Phe Ile Ala Gly Leu Thr Cys Arg Leu Ile Pro Ala Thr Leu 875 880 885 890 tac cct ggg cgc atc atc ctg tct ttg gac ttc att atg ttc tgc ctc 2801 Tyr Pro Gly Arg Ile Ile Leu Ser Leu Asp Phe Ile Met Phe Cys Leu 895 900 905 cgc ctc atg cac atc ttc acc att agc aag aca ctg ggg ccc aag ata 2849 Arg Leu Met His Ile Phe Thr Ile Ser Lys Thr Leu Gly Pro Lys Ile 910 915 920 atc atc gtg aag cgg atg atg aag gac gtc ttc ttc ttc ctc ttt ctc 2897 Ile Ile Val Lys Arg Met Met Lys Asp Val Phe Phe Phe Leu Phe Leu 925 930 935 ctg gcg gtg tgg gtg gtg tcc ttc gga gtg gcc aag cag gcc atc ctc 2945 Leu Ala Val Trp Val Val Ser Phe Gly Val Ala Lys Gln Ala Ile Leu 940 945 950 atc cac aat gag agc cgc gtg gac tgg atc ttc cgc gga gtt atc tat 2993 Ile His Asn Glu Ser Arg Val Asp Trp Ile Phe Arg Gly Val Ile Tyr 955 960 965 970 cac tct tac ctt acc atc ttc ggg cag atc ccg acc tac att gac ggc 3041 His Ser Tyr Leu Thr Ile Phe Gly Gln Ile Pro Thr Tyr Ile Asp Gly 975 980 985 gtg aat ttc agc atg gac cag tgc agc ccc aat ggt aca gac ccc tac 3089 Val Asn Phe Ser Met Asp Gln Cys Ser Pro Asn Gly Thr Asp Pro Tyr 990 995 1000 aag ccc aag tgt cct gag agt gac tgg aca ggg cag gca ccc gcc ttc 3137 Lys Pro Lys Cys Pro Glu Ser Asp Trp Thr Gly Gln Ala Pro Ala Phe 1005 1010 1015 ccc gag tgg ctg aca gtc acc ctt ctc tgc ctc tac ctg ctc ttc gcc 3185 Pro Glu Trp Leu Thr Val Thr Leu Leu Cys Leu Tyr Leu Leu Phe Ala 1020 1025 1030 aac atc ctg ctg ctt aat ttg ctc atc gcc atg ttc aac tac acc ttc 3233 Asn Ile Leu Leu Leu Asn Leu Leu Ile Ala Met Phe Asn Tyr Thr Phe 1035 1040 1045 1050 cag gag gtg cag gag cac aca gac cag atc tgg aag ttc cag cgc cac 3281 Gln Glu Val Gln Glu His Thr Asp Gln Ile Trp Lys Phe Gln Arg His 1055 1060 1065 gac ctg att gag gag tac cac ggc cgg ccc ccg gcc cct ccc cca ctc 3329 Asp Leu Ile Glu Glu Tyr His Gly Arg Pro Pro Ala Pro Pro Pro Leu 1070 1075 1080 atc ctc ctc agc cac ctg cag ctc ctg atc aag agg att gtc ctg aag 3377 Ile Leu Leu Ser His Leu Gln Leu Leu Ile Lys Arg Ile Val Leu Lys 1085 1090 1095 atc ccc gcc aag agg cac aag cag ctc aag aac aag ctg gag aag aat 3425 Ile Pro Ala Lys Arg His Lys Gln Leu Lys Asn Lys Leu Glu Lys Asn 1100 1105 1110 gag gag gca gcc ctc ctg tcc tgg gag ctc tac ctg aag gag aat tac 3473 Glu Glu Ala Ala Leu Leu Ser Trp Glu Leu Tyr Leu Lys Glu Asn Tyr 1115 1120 1125 1130 ctg cag aac caa cag tac cag cac aaa cag cgg cca gag cag aag atc 3521 Leu Gln Asn Gln Gln Tyr Gln His Lys Gln Arg Pro Glu Gln Lys Ile 1135 1140 1145 cag gac atc agt gag aaa gtg gac acc atg gtg gat ctg ttg gac atg 3569 Gln Asp Ile Ser Glu Lys Val Asp Thr Met Val Asp Leu Leu Asp Met 1150 1155 1160 gac cgt gtg aag aga tca ggc tcc aca gag cag agg ctg gcc tcc ctt 3617 Asp Arg Val Lys Arg Ser Gly Ser Thr Glu Gln Arg Leu Ala Ser Leu 1165 1170 1175 gag gaa cag gtg act cag atg ggc aga tct ttg cac tgg atc gtg acg 3665 Glu Glu Gln Val Thr Gln Met Gly Arg Ser Leu His Trp Ile Val Thr 1180 1185 1190 acc ctg aag gac agt ggc ttt ggc tca ggg gcc ggt gca ctg acc ctg 3713 Thr Leu Lys Asp Ser Gly Phe Gly Ser Gly Ala Gly Ala Leu Thr Leu 1195 1200 1205 1210 gca gcc caa agg gcc ttc gac gag cca gat gct gag ctg agt atc agg 3761 Ala Ala Gln Arg Ala Phe Asp Glu Pro Asp Ala Glu Leu Ser Ile Arg 1215 1220 1225 aag aaa gga gag gag gga gga gat ggc tat cat gtg agc gcc cgg cac 3809 Lys Lys Gly Glu Glu Gly Gly Asp Gly Tyr His Val Ser Ala Arg His 1230 1235 1240 ctc ctc tac cct gat gcc cgc atc atg cgc ttc ccc gtg cct aat gag 3857 Leu Leu Tyr Pro Asp Ala Arg Ile Met Arg Phe Pro Val Pro Asn Glu 1245 1250 1255 aag gtg cct tgg gag gca gag ttt ctg atc tac gac cct ccg ttt tac 3905 Lys Val Pro Trp Glu Ala Glu Phe Leu Ile Tyr Asp Pro Pro Phe Tyr 1260 1265 1270 aca gct gag aag aag gat gcg act ctc aca gac cct gtg gga gac act 3953 Thr Ala Glu Lys Lys Asp Ala Thr Leu Thr Asp Pro Val Gly Asp Thr 1275 1280 1285 1290 gca gaa cct ctg tct aag atc aat tac aac gtc gtg gac gga ctg atg 4001 Ala Glu Pro Leu Ser Lys Ile Asn Tyr Asn Val Val Asp Gly Leu Met 1295 1300 1305 gac cgt tgc agc ttc cat ggg acc tat gtg gtc caa tat gga ttc cct 4049 Asp Arg Cys Ser Phe His Gly Thr Tyr Val Val Gln Tyr Gly Phe Pro 1310 1315 1320 ttg aac ccc atg ggc cgc acc ggg ttg cgt ggt cgt ggg agc ctc agc 4097 Leu Asn Pro Met Gly Arg Thr Gly Leu Arg Gly Arg Gly Ser Leu Ser 1325 1330 1335 tgg ttt ggt ccc aac cac act ctg cag cca gtt gtt acc cgg tgg aag 4145 Trp Phe Gly Pro Asn His Thr Leu Gln Pro Val Val Thr Arg Trp Lys 1340 1345 1350 agg aac cag ggt gga ggc atc tgc cgg aag agt gtc agg aag atg ttg 4193 Arg Asn Gln Gly Gly Gly Ile Cys Arg Lys Ser Val Arg Lys Met Leu 1355 1360 1365 1370 gag gtg ctg gtc atg aag ttg cct caa tcc gag cac tgg gcc ttg cct 4241 Glu Val Leu Val Met Lys Leu Pro Gln Ser Glu His Trp Ala Leu Pro 1375 1380 1385 ggg ggc tct cgg gag cca ggg aag atg cta cca cgg aag ctg aaa cag 4289 Gly Gly Ser Arg Glu Pro Gly Lys Met Leu Pro Arg Lys Leu Lys Gln 1390 1395 1400 gtc ctc cag cag gag tac tgg gtg acc ttt gag acc ttg cta agg caa 4337 Val Leu Gln Gln Glu Tyr Trp Val Thr Phe Glu Thr Leu Leu Arg Gln 1405 1410 1415 ggt aca gag gtg tac aaa gga tac gtg gat gac cca agg aac acg gac 4385 Gly Thr Glu Val Tyr Lys Gly Tyr Val Asp Asp Pro Arg Asn Thr Asp 1420 1425 1430 aat gcc tgg atc gag acg gtg gct gtc agc atc cat ttc cag gac cag 4433 Asn Ala Trp Ile Glu Thr Val Ala Val Ser Ile His Phe Gln Asp Gln 1435 1440 1445 1450 aat gat gtg gag ctg aag agg ctg gaa gag aac ctg caa act cat gat 4481 Asn Asp Val Glu Leu Lys Arg Leu Glu Glu Asn Leu Gln Thr His Asp 1455 1460 1465 cca aag gag tcg gcc cgt ggc ttg gag atg tct act gaa tgg cag gtt 4529 Pro Lys Glu Ser Ala Arg Gly Leu Glu Met Ser Thr Glu Trp Gln Val 1470 1475 1480 gta gac cgg cgg atc cct ctg tat gtg aac cac aag aag atc ctc caa 4577 Val Asp Arg Arg Ile Pro Leu Tyr Val Asn His Lys Lys Ile Leu Gln 1485 1490 1495 aag gtg gcc tcg ctg ttt ggc gct cac ttc tga ccgtgggttc ttgtggaagc 4630 Lys Val Ala Ser Leu Phe Gly Ala His Phe 1500 1505 tccaggggaa ggggtgatca tccatcaatg acccccctcc aagacttgga ctgggtggca 4690 ggttggggta ctgggttggg gtggtaggtt gttgggctgg gttgggtg 4738 4 1508 PRT Rattus sp. 4 Met Glu Pro Leu Asp Gln Arg Arg Thr Asp Ser Asp Gln Glu Glu Gly 1 5 10 15 Phe Gly Val Gln Ser Arg Arg Ala Thr Asp Leu Gly Met Val Pro Asn 20 25 30 Leu Arg Arg Ser Asn Ser Ser Leu Cys Lys Ser Arg Arg Leu Leu Cys 35 40 45 Ser Phe Ser Ser Glu Lys Gln Glu Asn Leu Ser Ser Trp Ile Pro Glu 50 55 60 Asn Ile Lys Lys Lys Glu Cys Val Tyr Phe Val Glu Ser Ser Lys Leu 65 70 75 80 Ser Asp Ala Gly Lys Val Val Cys Glu Cys Gly Tyr Thr His Glu Gln 85 90 95 His Ile Glu Val Ala Ile Lys Pro His Thr Phe Gln Gly Lys Glu Trp 100 105 110 Asp Pro Lys Lys His Val His Glu Met Pro Thr Asp Ala Phe Gly Asp 115 120 125 Ile Val Phe Thr Gly Leu Ser Gln Lys Val Gly Lys Tyr Val Arg Leu 130 135 140 Ser Gln Asp Thr Ser Ser Ile Val Ile Tyr Gln Leu Met Thr Gln His 145 150 155 160 Trp Gly Leu Asp Val Pro Ser Leu Leu Ile Ser Val Thr Gly Gly Ala 165 170 175 Lys Asn Phe Asn Met Lys Leu Arg Leu Lys Ser Ile Phe Arg Arg Gly 180 185 190 Leu Val Lys Val Ala Gln Thr Thr Gly Ala Trp Ile Ile Thr Gly Gly 195 200 205 Ser His Thr Gly Val Met Lys Gln Val Gly Glu Ala Val Arg Asp Phe 210 215 220 Ser Leu Ser Ser Ser Cys Lys Glu Gly Asp Val Ile Thr Ile Gly Ile 225 230 235 240 Ala Thr Trp Gly Thr Ile His Asn Arg Glu Ala Leu Ile His Pro Met 245 250 255 Gly Gly Phe Pro Ala Glu Tyr Met Leu Asp Glu Glu Gly Gln Gly Asn 260 265 270 Leu Thr Cys Leu Asp Ser Asn His Ser His Phe Ile Leu Val Asp Asp 275 280 285 Gly Thr His Gly Gln Tyr Gly Val Glu Ile Pro Leu Arg Thr Lys Leu 290 295 300 Glu Lys Phe Ile Ser Glu Gln Thr Lys Glu Arg Gly Gly Val Ala Ile 305 310 315 320 Lys Ile Pro Ile Val Cys Val Val Leu Glu Gly Gly Pro Gly Thr Leu 325 330 335 His Thr Ile Tyr Asn Ala Ile Thr Asn Gly Thr Pro Cys Val Ile Val 340 345 350 Glu Gly Ser Gly Arg Val Ala Asp Val Ile Ala Gln Val Ala Ala Leu 355 360 365 Pro Val Ser Glu Ile Thr Ile Ser Leu Ile Gln Gln Lys Leu Ser Val 370 375 380 Phe Phe Gln Glu Met Phe Glu Thr Phe Thr Glu Asn Gln Ile Val Glu 385 390 395 400 Trp Thr Lys Lys Ile Gln Asp Ile Val Arg Arg Arg Gln Leu Leu Thr 405 410 415 Val Phe Arg Glu Gly Lys Asp Gly Gln Gln Asp Val Asp Val Ala Ile 420 425 430 Leu Gln Ala Leu Leu Lys Ala Ser Arg Ser Gln Asp His Phe Gly His 435 440 445 Glu Asn Trp Asp His Gln Leu Lys Leu Ala Val Ala Trp Asn Arg Val 450 455 460 Asp Ile Ala Arg Ser Glu Ile Phe Thr Asp Glu Trp Gln Trp Lys Pro 465 470 475 480 Ser Asp Leu His Pro Met Met Thr Ala Ala Leu Ile Ser Asn Lys Pro 485 490 495 Glu Phe Val Arg Leu Phe Leu Glu Asn Gly Val Arg Leu Lys Glu Phe 500 505 510 Val Thr Trp Asp Thr Leu Leu Cys Leu Tyr Glu Asn Leu Glu Pro Ser 515 520 525 Cys Leu Phe His Ser Lys Leu Gln Lys Val Leu Ala Glu Glu His Glu 530 535 540 Arg Leu Ala Tyr Ala Ser Glu Thr Pro Arg Leu Gln Met His His Val 545 550 555 560 Ala Gln Val Leu Arg Glu Leu Leu Gly Asp Ser Thr Gln Leu Leu Tyr 565 570 575 Pro Arg Pro Arg Tyr Thr Asp Arg Pro Arg Leu Ser Leu Pro Met Pro 580 585 590 His Ile Lys Leu Asn Val Gln Gly Val Ser Leu Arg Ser Leu Tyr Lys 595 600 605 Arg Ser Thr Gly His Val Thr Phe Thr Ile Asp Pro Val Arg Asp Leu 610 615 620 Leu Ile Trp Ala Ile Ile Gln Asn His Arg Glu Leu Ala Gly Ile Ile 625 630 635 640 Trp Ala Gln Ser Gln Asp Cys Thr Ala Ala Ala Leu Ala Cys Ser Lys 645 650 655 Ile Leu Lys Glu Leu Ser Lys Glu Glu Glu Asp Thr Asp Ser Ser Glu 660 665 670 Glu Met Leu Ala Leu Ala Asp Glu Phe Glu His Arg Ala Ile Gly Val 675 680 685 Phe Thr Glu Cys Tyr Arg Lys Asp Glu Glu Arg Ala Gln Lys Leu Leu 690 695 700 Val Arg Val Ser Glu Ala Trp Gly Lys Thr Thr Cys Leu Gln Leu Ala 705 710 715 720 Leu Glu Ala Lys Asp Met Lys Phe Val Ser His Gly Gly Ile Gln Ala 725 730 735 Phe Leu Thr Lys Val Trp Trp Gly Gln Leu Cys Val Asp Asn Gly Leu 740 745 750 Trp Arg Ile Ile Leu Cys Met Leu Ala Phe Pro Leu Leu Phe Thr Gly 755 760 765 Phe Ile Ser Phe Arg Glu Lys Arg Leu Gln Ala Leu Cys Arg Pro Ala 770 775 780 Arg Val Arg Ala Phe Phe Asn Ala Pro Val Val Ile Phe Tyr Leu Asn 785 790 795 800 Ile Leu Ser Tyr Phe Ala Phe Leu Cys Leu Phe Ala Tyr Val Leu Met 805 810 815 Val Asp Phe Gln Pro Ser Pro Ser Trp Cys Glu Tyr Leu Ile Tyr Leu 820 825 830 Trp Leu Phe Ser Leu Val Cys Glu Glu Thr Arg Gln Leu Phe Tyr Asp 835 840 845 Pro Asp Gly Cys Gly Leu Met Lys Met Ala Ser Leu Tyr Phe Ser Asp 850 855 860 Phe Trp Asn Lys Leu Asp Val Gly Ala Ile Leu Leu Phe Ile Ala Gly 865 870 875 880 Leu Thr Cys Arg Leu Ile Pro Ala Thr Leu Tyr Pro Gly Arg Ile Ile 885 890 895 Leu Ser Leu Asp Phe Ile Met Phe Cys Leu Arg Leu Met His Ile Phe 900 905 910 Thr Ile Ser Lys Thr Leu Gly Pro Lys Ile Ile Ile Val Lys Arg Met 915 920 925 Met Lys Asp Val Phe Phe Phe Leu Phe Leu Leu Ala Val Trp Val Val 930 935 940 Ser Phe Gly Val Ala Lys Gln Ala Ile Leu Ile His Asn Glu Ser Arg 945 950 955 960 Val Asp Trp Ile Phe Arg Gly Val Ile Tyr His Ser Tyr Leu Thr Ile 965 970 975 Phe Gly Gln Ile Pro Thr Tyr Ile Asp Gly Val Asn Phe Ser Met Asp 980 985 990 Gln Cys Ser Pro Asn Gly Thr Asp Pro Tyr Lys Pro Lys Cys Pro Glu 995 1000 1005 Ser Asp Trp Thr Gly Gln Ala Pro Ala Phe Pro Glu Trp Leu Thr Val 1010 1015 1020 Thr Leu Leu Cys Leu Tyr Leu Leu Phe Ala Asn Ile Leu Leu Leu Asn 1025 1030 1035 1040 Leu Leu Ile Ala Met Phe Asn Tyr Thr Phe Gln Glu Val Gln Glu His 1045 1050 1055 Thr Asp Gln Ile Trp Lys Phe Gln Arg His Asp Leu Ile Glu Glu Tyr 1060 1065 1070 His Gly Arg Pro Pro Ala Pro Pro Pro Leu Ile Leu Leu Ser His Leu 1075 1080 1085 Gln Leu Leu Ile Lys Arg Ile Val Leu Lys Ile Pro Ala Lys Arg His 1090 1095 1100 Lys Gln Leu Lys Asn Lys Leu Glu Lys Asn Glu Glu Ala Ala Leu Leu 1105 1110 1115 1120 Ser Trp Glu Leu Tyr Leu Lys Glu Asn Tyr Leu Gln Asn Gln Gln Tyr 1125 1130 1135 Gln His Lys Gln Arg Pro Glu Gln Lys Ile Gln Asp Ile Ser Glu Lys 1140 1145 1150 Val Asp Thr Met Val Asp Leu Leu Asp Met Asp Arg Val Lys Arg Ser 1155 1160 1165 Gly Ser Thr Glu Gln Arg Leu Ala Ser Leu Glu Glu Gln Val Thr Gln 1170 1175 1180 Met Gly Arg Ser Leu His Trp Ile Val Thr Thr Leu Lys Asp Ser Gly 1185 1190 1195 1200 Phe Gly Ser Gly Ala Gly Ala Leu Thr Leu Ala Ala Gln Arg Ala Phe 1205 1210 1215 Asp Glu Pro Asp Ala Glu Leu Ser Ile Arg Lys Lys Gly Glu Glu Gly 1220 1225 1230 Gly Asp Gly Tyr His Val Ser Ala Arg His Leu Leu Tyr Pro Asp Ala 1235 1240 1245 Arg Ile Met Arg Phe Pro Val Pro Asn Glu Lys Val Pro Trp Glu Ala 1250 1255 1260 Glu Phe Leu Ile Tyr Asp Pro Pro Phe Tyr Thr Ala Glu Lys Lys Asp 1265 1270 1275 1280 Ala Thr Leu Thr Asp Pro Val Gly Asp Thr Ala Glu Pro Leu Ser Lys 1285 1290 1295 Ile Asn Tyr Asn Val Val Asp Gly Leu Met Asp Arg Cys Ser Phe His 1300 1305 1310 Gly Thr Tyr Val Val Gln Tyr Gly Phe Pro Leu Asn Pro Met Gly Arg 1315 1320 1325 Thr Gly Leu Arg Gly Arg Gly Ser Leu Ser Trp Phe Gly Pro Asn His 1330 1335 1340 Thr Leu Gln Pro Val Val Thr Arg Trp Lys Arg Asn Gln Gly Gly Gly 1345 1350 1355 1360 Ile Cys Arg Lys Ser Val Arg Lys Met Leu Glu Val Leu Val Met Lys 1365 1370 1375 Leu Pro Gln Ser Glu His Trp Ala Leu Pro Gly Gly Ser Arg Glu Pro 1380 1385 1390 Gly Lys Met Leu Pro Arg Lys Leu Lys Gln Val Leu Gln Gln Glu Tyr 1395 1400 1405 Trp Val Thr Phe Glu Thr Leu Leu Arg Gln Gly Thr Glu Val Tyr Lys 1410 1415 1420 Gly Tyr Val Asp Asp Pro Arg Asn Thr Asp Asn Ala Trp Ile Glu Thr 1425 1430 1435 1440 Val Ala Val Ser Ile His Phe Gln Asp Gln Asn Asp Val Glu Leu Lys 1445 1450 1455 Arg Leu Glu Glu Asn Leu Gln Thr His Asp Pro Lys Glu Ser Ala Arg 1460 1465 1470 Gly Leu Glu Met Ser Thr Glu Trp Gln Val Val Asp Arg Arg Ile Pro 1475 1480 1485 Leu Tyr Val Asn His Lys Lys Ile Leu Gln Lys Val Ala Ser Leu Phe 1490 1495 1500 Gly Ala His Phe 1505 5 18 DNA Homo sapiens 5 agctggcgtg ggggtctc 18 6 20 DNA Homo sapiens 6 ctcctcccgg gtcaccttga 20 7 20 DNA Homo sapiens 7 tctccggcgc agcaacagca 20 8 20 DNA Homo sapiens 8 ccctcgcggc ggtggacagt 20 9 18 DNA Rattus sp. 9 cccccaacct cacaaatg 18 10 19 DNA Rattus sp. 10 cacccaaccc agcccaaca 19 11 20 DNA Rattus sp. 11 gggccatcat ccagaaccac 20 12 20 DNA Rattus sp. 12 aggccattgt ccacgcagag 20 13 4808 DNA Mus musculus CDS (36)..(4559) 13 gtctctgtcc tcgggtgaat ctggagccgt ggagg atg gag tcc ttg gac cgg 53 Met Glu Ser Leu Asp Arg 1 5 aga aga act ggc tct gag cag gag gag ggc ttt ggg gtg cag tca agg 101 Arg Arg Thr Gly Ser Glu Gln Glu Glu Gly Phe Gly Val Gln Ser Arg 10 15 20 agg gcc act gac ctg ggc atg gtc ccc aat ctc cga cga agc aat agc 149 Arg Ala Thr Asp Leu Gly Met Val Pro Asn Leu Arg Arg Ser Asn Ser 25 30 35 agc ctt tgc aag agc agg aga ttt ctg tgc tct ttc agc agt gag aag 197 Ser Leu Cys Lys Ser Arg Arg Phe Leu Cys Ser Phe Ser Ser Glu Lys 40 45 50 caa gaa aac ctt agc tca tgg att ccc gag aat atc aag aag aag gag 245 Gln Glu Asn Leu Ser Ser Trp Ile Pro Glu Asn Ile Lys Lys Lys Glu 55 60 65 70 tgt gtg tac ttc gtg gaa agt tcc aaa ctc tcg gac gca ggg aag gta 293 Cys Val Tyr Phe Val Glu Ser Ser Lys Leu Ser Asp Ala Gly Lys Val 75 80 85 gtg tgt gcg tgt ggt tat acc cac gag caa cac ttg gag gtg gcc atc 341 Val Cys Ala Cys Gly Tyr Thr His Glu Gln His Leu Glu Val Ala Ile 90 95 100 aag cca cac acc ttc cag ggc aag gag tgg gat cca aag aaa cac gtc 389 Lys Pro His Thr Phe Gln Gly Lys Glu Trp Asp Pro Lys Lys His Val 105 110 115 caa gag atg ccc aca gat gcc ttt ggt gac atc gtt ttc aca gac ctg 437 Gln Glu Met Pro Thr Asp Ala Phe Gly Asp Ile Val Phe Thr Asp Leu 120 125 130 agc cag aaa gtg ggg aag tat gtc cgg gtc tcc cag gac acg ccc tcc 485 Ser Gln Lys Val Gly Lys Tyr Val Arg Val Ser Gln Asp Thr Pro Ser 135 140 145 150 agt gtc atc tac cag ctc atg acc cag cac tgg ggc cta gat gtc ccc 533 Ser Val Ile Tyr Gln Leu Met Thr Gln His Trp Gly Leu Asp Val Pro 155 160 165 aac ctc ctc atc tcc gtg acc ggt ggg gcc aag aac ttc aac atg aag 581 Asn Leu Leu Ile Ser Val Thr Gly Gly Ala Lys Asn Phe Asn Met Lys 170 175 180 ctg agg ctg aag agc atc ttc cgg aga ggc ttg gtc aag gtg gct caa 629 Leu Arg Leu Lys Ser Ile Phe Arg Arg Gly Leu Val Lys Val Ala Gln 185 190 195 acc acg ggg gcc tgg atc atc act gga gga tcc cac aca ggc gtg atg 677 Thr Thr Gly Ala Trp Ile Ile Thr Gly Gly Ser His Thr Gly Val Met 200 205 210 aag cag gtg ggc gaa gcg gta cgg gac ttc agt ctg agc agc agc tgc 725 Lys Gln Val Gly Glu Ala Val Arg Asp Phe Ser Leu Ser Ser Ser Cys 215 220 225 230 aaa gaa ggt gaa gtc atc act att ggc gta gcc acg tgg ggc acc atc 773 Lys Glu Gly Glu Val Ile Thr Ile Gly Val Ala Thr Trp Gly Thr Ile 235 240 245 cac aac cgc gag gga ctg atc cat ccc atg gga ggc ttc ccc gcc gag 821 His Asn Arg Glu Gly Leu Ile His Pro Met Gly Gly Phe Pro Ala Glu 250 255 260 tac atg ctg gat gag gaa ggc caa ggg aac ctg acc tgc ttg gac agc 869 Tyr Met Leu Asp Glu Glu Gly Gln Gly Asn Leu Thr Cys Leu Asp Ser 265 270 275 aac cat tcc cac ttc atc ttg gtg gat gat ggg acc cac ggg caa tat 917 Asn His Ser His Phe Ile Leu Val Asp Asp Gly Thr His Gly Gln Tyr 280 285 290 ggt gtg gag att ccg ctg agg act aag ctg gaa aag ttc atc tca gag 965 Gly Val Glu Ile Pro Leu Arg Thr Lys Leu Glu Lys Phe Ile Ser Glu 295 300 305 310 caa acg aag gaa agg gga ggt gtg gcc atc aag atc ccc att gtc tgc 1013 Gln Thr Lys Glu Arg Gly Gly Val Ala Ile Lys Ile Pro Ile Val Cys 315 320 325 gtg gtg ttg gag ggt ggc cct ggc act ctg cat aca atc tac aat gcc 1061 Val Val Leu Glu Gly Gly Pro Gly Thr Leu His Thr Ile Tyr Asn Ala 330 335 340 atc aac aat ggc aca ccc tgc gtg ata gtg gag ggc tct ggc cga gtg 1109 Ile Asn Asn Gly Thr Pro Cys Val Ile Val Glu Gly Ser Gly Arg Val 345 350 355 gct gac gtc atc gct cag gta gct act ctg cct gtc tct gag atc acc 1157 Ala Asp Val Ile Ala Gln Val Ala Thr Leu Pro Val Ser Glu Ile Thr 360 365 370 atc tcc ttg atc cag cag aag ctc agc ata ttc ttc cag gag atg ttt 1205 Ile Ser Leu Ile Gln Gln Lys Leu Ser Ile Phe Phe Gln Glu Met Phe 375 380 385 390 gag act ttc acc gaa aac cag att gtg gaa tgg acc aaa aag atc caa 1253 Glu Thr Phe Thr Glu Asn Gln Ile Val Glu Trp Thr Lys Lys Ile Gln 395 400 405 gac att gtc cgg agg cgg cag ctg ctg acg atc ttc cgg gaa ggc aag 1301 Asp Ile Val Arg Arg Arg Gln Leu Leu Thr Ile Phe Arg Glu Gly Lys 410 415 420 gat ggt cag cag gat gtg gat gtg gcc att ctg cag gcg tta ctg aaa 1349 Asp Gly Gln Gln Asp Val Asp Val Ala Ile Leu Gln Ala Leu Leu Lys 425 430 435 gcc tct cga agc caa gac cac ttt ggc cac gag aac tgg gac cac caa 1397 Ala Ser Arg Ser Gln Asp His Phe Gly His Glu Asn Trp Asp His Gln 440 445 450 ctg aag ttg gct gtg gcc tgg aac cgc gtg gac atc gct cgc agt gag 1445 Leu Lys Leu Ala Val Ala Trp Asn Arg Val Asp Ile Ala Arg Ser Glu 455 460 465 470 atc ttc acc gat gaa tgg cag tgg aag cct gca gat ctg cat ccc atg 1493 Ile Phe Thr Asp Glu Trp Gln Trp Lys Pro Ala Asp Leu His Pro Met 475 480 485 atg acg gcc gct ctc atc tcc aac aag cct gag ttc gtg agg ctc ttt 1541 Met Thr Ala Ala Leu Ile Ser Asn Lys Pro Glu Phe Val Arg Leu Phe 490 495 500 ctg gag aat ggg gtg cgg ctc aag gag ttt gtc act tgg gat act ctt 1589 Leu Glu Asn Gly Val Arg Leu Lys Glu Phe Val Thr Trp Asp Thr Leu 505 510 515 ctc tgc ctg tac gag aac ctg gag ccg tcc tgt ctc ttc cac agc aag 1637 Leu Cys Leu Tyr Glu Asn Leu Glu Pro Ser Cys Leu Phe His Ser Lys 520 525 530 cta cag aag gtg ctg gcc gaa gaa cag cgc tta gcc tat gca tct gca 1685 Leu Gln Lys Val Leu Ala Glu Glu Gln Arg Leu Ala Tyr Ala Ser Ala 535 540 545 550 aca ccc cgc ctg cac atg cac cat gtg gcc cag gtg ctt cgt gaa ctc 1733 Thr Pro Arg Leu His Met His His Val Ala Gln Val Leu Arg Glu Leu 555 560 565 ctg ggg gac tcc acg cag ctg ctg tac ccc cgg ccc cgg tac act gac 1781 Leu Gly Asp Ser Thr Gln Leu Leu Tyr Pro Arg Pro Arg Tyr Thr Asp 570 575 580 agg cca cgg ctc tcg atg acc gtg cca cac atc aag ctg aac gtg cag 1829 Arg Pro Arg Leu Ser Met Thr Val Pro His Ile Lys Leu Asn Val Gln 585 590 595 gga gtg agc ctc cgg tcc ctc tat aag cga tca aca ggc cac gtt acc 1877 Gly Val Ser Leu Arg Ser Leu Tyr Lys Arg Ser Thr Gly His Val Thr 600 605 610 ttc acc att gac cca gtc cgt gac ctt ctc att tgg gcc gtt atc cag 1925 Phe Thr Ile Asp Pro Val Arg Asp Leu Leu Ile Trp Ala Val Ile Gln 615 620 625 630 aac cac agg gag ctg gca ggc atc atc tgg gct cag agt cag gac tgt 1973 Asn His Arg Glu Leu Ala Gly Ile Ile Trp Ala Gln Ser Gln Asp Cys 635 640 645 act gcc gca gca ctg gcc tgt agc aag atc ctg aag gag ctg tcc aag 2021 Thr Ala Ala Ala Leu Ala Cys Ser Lys Ile Leu Lys Glu Leu Ser Lys 650 655 660 gag gag gaa gat aca gac agc tct gag gag atg ctg gca ctg gca gac 2069 Glu Glu Glu Asp Thr Asp Ser Ser Glu Glu Met Leu Ala Leu Ala Asp 665 670 675 gag ttt gag cac aga gct ata ggc gtc ttc act gag tgc tac agg aag 2117 Glu Phe Glu His Arg Ala Ile Gly Val Phe Thr Glu Cys Tyr Arg Lys 680 685 690 gat gag gaa aga gcc cag aag ctg ctt gtc cgt gtg tct gag gcc tgg 2165 Asp Glu Glu Arg Ala Gln Lys Leu Leu Val Arg Val Ser Glu Ala Trp 695 700 705 710 ggg aag acc acc tgc ctg cag ctg gcc cta gag gcc aag gac atg aaa 2213 Gly Lys Thr Thr Cys Leu Gln Leu Ala Leu Glu Ala Lys Asp Met Lys 715 720 725 ttc gtg tct cat gga ggc atc cag gct ttc cta acc aag gtg tgg tgg 2261 Phe Val Ser His Gly Gly Ile Gln Ala Phe Leu Thr Lys Val Trp Trp 730 735 740 ggc cag ctc tgt gtg gac aat ggc ctg tgg agg atc atc ctg tgc atg 2309 Gly Gln Leu Cys Val Asp Asn Gly Leu Trp Arg Ile Ile Leu Cys Met 745 750 755 ctg gcc ttc ccg ctg ctc ttc acc ggc ttc atc tcc ttc agg gaa aag 2357 Leu Ala Phe Pro Leu Leu Phe Thr Gly Phe Ile Ser Phe Arg Glu Lys 760 765 770 agg ctg cag gca ctg tgt cgc cca gcc cgc gtc cgc gcc ttc ttc aat 2405 Arg Leu Gln Ala Leu Cys Arg Pro Ala Arg Val Arg Ala Phe Phe Asn 775 780 785 790 gcg cct gtg gtc atc ttc cac atg aat atc ctc tcc tac ttt gcc ttc 2453 Ala Pro Val Val Ile Phe His Met Asn Ile Leu Ser Tyr Phe Ala Phe 795 800 805 ctc tgc ctg ttc gcc tac gtg ctc atg gtg gac ttc cag cct tct cca 2501 Leu Cys Leu Phe Ala Tyr Val Leu Met Val Asp Phe Gln Pro Ser Pro 810 815 820 tcc tgg tgc gag tac ctc atc tac ctg tgg ctc ttc tcc ctg gtg tgc 2549 Ser Trp Cys Glu Tyr Leu Ile Tyr Leu Trp Leu Phe Ser Leu Val Cys 825 830 835 gaa gag act cgg cag cta ttc tat gat cct gat ggc tgt gga cta atg 2597 Glu Glu Thr Arg Gln Leu Phe Tyr Asp Pro Asp Gly Cys Gly Leu Met 840 845 850 aag atg gcg tcc ctg tac ttc agt gac ttc tgg aac aaa ctg gac gtt 2645 Lys Met Ala Ser Leu Tyr Phe Ser Asp Phe Trp Asn Lys Leu Asp Val 855 860 865 870 ggg gcc att ctg ctc ttc ata gta gga ctg acc tgt cgg ctc atc cca 2693 Gly Ala Ile Leu Leu Phe Ile Val Gly Leu Thr Cys Arg Leu Ile Pro 875 880 885 gcg acg ctg tac cct ggg cgc atc atc ctg tct ttg gac ttc atc atg 2741 Ala Thr Leu Tyr Pro Gly Arg Ile Ile Leu Ser Leu Asp Phe Ile Met 890 895 900 ttc tgt ctc cgt ctc atg cac atc ttc act att agc aag aca ctg ggg 2789 Phe Cys Leu Arg Leu Met His Ile Phe Thr Ile Ser Lys Thr Leu Gly 905 910 915 ccc aag ata atc atc gtg aag cgg atg atg aag gac gtc ttc ttc ttc 2837 Pro Lys Ile Ile Ile Val Lys Arg Met Met Lys Asp Val Phe Phe Phe 920 925 930 ctc ttt ctc ctg gcg gtg tgg gtg gtg tcc ttc ggc gta gct aag cag 2885 Leu Phe Leu Leu Ala Val Trp Val Val Ser Phe Gly Val Ala Lys Gln 935 940 945 950 gcc att ctc ata cat aac gag agc cgc gtg gac tgg atc ttc cgt ggg 2933 Ala Ile Leu Ile His Asn Glu Ser Arg Val Asp Trp Ile Phe Arg Gly 955 960 965 gtt gtc tat cac tct tac ctg acc atc ttt ggc cag atc cca acc tac 2981 Val Val Tyr His Ser Tyr Leu Thr Ile Phe Gly Gln Ile Pro Thr Tyr 970 975 980 att gac ggt gtg aat ttc agc atg gac cag tgc agc ccc aat ggc acg 3029 Ile Asp Gly Val Asn Phe Ser Met Asp Gln Cys Ser Pro Asn Gly Thr 985 990 995 gac ccc tac aag cct aag tgt cct gag agc gac tgg acg gga cag gca 3077 Asp Pro Tyr Lys Pro Lys Cys Pro Glu Ser Asp Trp Thr Gly Gln Ala 1000 1005 1010 cct gcc ttc ccc gag tgg ctg act gtc acc ctg ctc tgc ctc tac ctg 3125 Pro Ala Phe Pro Glu Trp Leu Thr Val Thr Leu Leu Cys Leu Tyr Leu 1015 1020 1025 1030 ctc ttt gcc aac atc ctg ctg ctt aac ctg ctc atc gcc atg ttc aac 3173 Leu Phe Ala Asn Ile Leu Leu Leu Asn Leu Leu Ile Ala Met Phe Asn 1035 1040 1045 tac acc ttc cag gag gtg cag gaa cac aca gac cag atc tgg aaa ttc 3221 Tyr Thr Phe Gln Glu Val Gln Glu His Thr Asp Gln Ile Trp Lys Phe 1050 1055 1060 cag cgc cac gac ctg atc gag gag tac cat ggc cgt ccc ccg gca cct 3269 Gln Arg His Asp Leu Ile Glu Glu Tyr His Gly Arg Pro Pro Ala Pro 1065 1070 1075 ccc cca ctc atc ctc ctc agc cac ctg cag ctc ctg atc aag agg att 3317 Pro Pro Leu Ile Leu Leu Ser His Leu Gln Leu Leu Ile Lys Arg Ile 1080 1085 1090 gtc ctg aag atc cct gcc aag agg cat aag cag ctc aag aac aag ctg 3365 Val Leu Lys Ile Pro Ala Lys Arg His Lys Gln Leu Lys Asn Lys Leu 1095 1100 1105 1110 gag aag aac gag gag aca gcg ctc ctg tct tgg gaa ctg tac ctg aag 3413 Glu Lys Asn Glu Glu Thr Ala Leu Leu Ser Trp Glu Leu Tyr Leu Lys 1115 1120 1125 gag aac tac ctg cag aac cag cag tac cag cag aaa cag cgt cca gag 3461 Glu Asn Tyr Leu Gln Asn Gln Gln Tyr Gln Gln Lys Gln Arg Pro Glu 1130 1135 1140 cag aaa atc caa gac atc agt gag aaa gtg gac acc atg gtg gat ctg 3509 Gln Lys Ile Gln Asp Ile Ser Glu Lys Val Asp Thr Met Val Asp Leu 1145 1150 1155 ctg gac atg gac cag gtg aag agg tca ggc tcc aca gag cag aga ctg 3557 Leu Asp Met Asp Gln Val Lys Arg Ser Gly Ser Thr Glu Gln Arg Leu 1160 1165 1170 gct tcc ctg gag gaa cag gtg act cag gtg acc aga gct ttg cac tgg 3605 Ala Ser Leu Glu Glu Gln Val Thr Gln Val Thr Arg Ala Leu His Trp 1175 1180 1185 1190 atc gtg aca acc ctg aag gac agt ggc ttt ggc tca gga gca ggt gcg 3653 Ile Val Thr Thr Leu Lys Asp Ser Gly Phe Gly Ser Gly Ala Gly Ala 1195 1200 1205 ctg acc ctg gca ccc cag agg gcc ttc gat gag cca gat gct gag ctg 3701 Leu Thr Leu Ala Pro Gln Arg Ala Phe Asp Glu Pro Asp Ala Glu Leu 1210 1215 1220 agt atc agg agg aaa gta gag gaa cca gga gat ggt tac cac gtg agc 3749 Ser Ile Arg Arg Lys Val Glu Glu Pro Gly Asp Gly Tyr His Val Ser 1225 1230 1235 gcc cgg cat ctc ctc tat ccc aat gcc cgc atc atg cgc ttc ccc gtg 3797 Ala Arg His Leu Leu Tyr Pro Asn Ala Arg Ile Met Arg Phe Pro Val 1240 1245 1250 cct aac gag aag gtg cct tgg gcg gca gag ttt ctg atc tac gat cct 3845 Pro Asn Glu Lys Val Pro Trp Ala Ala Glu Phe Leu Ile Tyr Asp Pro 1255 1260 1265 1270 ccc ttt tac acc gct gag aag gat gtg gct ctc aca gac ccc gtg gga 3893 Pro Phe Tyr Thr Ala Glu Lys Asp Val Ala Leu Thr Asp Pro Val Gly 1275 1280 1285 gac act gca gaa cct ctg tct aag atc agt tac aac gtc gtg gat gga 3941 Asp Thr Ala Glu Pro Leu Ser Lys Ile Ser Tyr Asn Val Val Asp Gly 1290 1295 1300 ccg acg gac cgt cgc agc ttc cat gga gtc tac gtg gtc gag tat ggg 3989 Pro Thr Asp Arg Arg Ser Phe His Gly Val Tyr Val Val Glu Tyr Gly 1305 1310 1315 ttc ccg tgt gaa ccc cat ggg ccg cga cag ggt tgc tgt ggt cgt ggg 4037 Phe Pro Cys Glu Pro His Gly Pro Arg Gln Gly Cys Cys Gly Arg Gly 1320 1325 1330 agc ctc agc tgg ttt ggt ccc aac cac act ctg cag cca gtt gtc acc 4085 Ser Leu Ser Trp Phe Gly Pro Asn His Thr Leu Gln Pro Val Val Thr 1335 1340 1345 1350 cgg tgg aag agg aac cag ggt gga gcc atc tgc cgg aag agt gtc agg 4133 Arg Trp Lys Arg Asn Gln Gly Gly Ala Ile Cys Arg Lys Ser Val Arg 1355 1360 1365 aag atg ctg gag gtg cta gtg atg aag ctg cct cgc tct gag cac tgg 4181 Lys Met Leu Glu Val Leu Val Met Lys Leu Pro Arg Ser Glu His Trp 1370 1375 1380 gcc ttg cct ggg ggc tct agg gag cca ggg gag atg cta cca cgg aag 4229 Ala Leu Pro Gly Gly Ser Arg Glu Pro Gly Glu Met Leu Pro Arg Lys 1385 1390 1395 ctg aaa cgg gtc ctc cgg cag gag ttc tgg gtg gcc ttt gag acc ttg 4277 Leu Lys Arg Val Leu Arg Gln Glu Phe Trp Val Ala Phe Glu Thr Leu 1400 1405 1410 ctg atg caa ggt aca gag gta tac aaa ggg tac gtg gat gac cca agg 4325 Leu Met Gln Gly Thr Glu Val Tyr Lys Gly Tyr Val Asp Asp Pro Arg 1415 1420 1425 1430 aac aca gac aat gcc tgg atc gag aca gtg gct gtc agc atc cat ttt 4373 Asn Thr Asp Asn Ala Trp Ile Glu Thr Val Ala Val Ser Ile His Phe 1435 1440 1445 cag gac cag aat gat atg gag ctg aag agg ctg gaa gag aac ctg cac 4421 Gln Asp Gln Asn Asp Met Glu Leu Lys Arg Leu Glu Glu Asn Leu His 1450 1455 1460 act cat gat cca aag gag ttg acc cgt gac ctg aag ctg tct act gaa 4469 Thr His Asp Pro Lys Glu Leu Thr Arg Asp Leu Lys Leu Ser Thr Glu 1465 1470 1475 tgg cag gtg gta gac cgg cgg atc cct ctg tat gcg aac cac aag acc 4517 Trp Gln Val Val Asp Arg Arg Ile Pro Leu Tyr Ala Asn His Lys Thr 1480 1485 1490 atc ctc cag aag gtg gcc tca ctg ttt gga gct cac ttc tga 4559 Ile Leu Gln Lys Val Ala Ser Leu Phe Gly Ala His Phe 1495 1500 1505 ctgtggcttc tgggccacaa tggcccccca agacttggac tgctgtcttg ggctggatgg 4619 ctggttgggg tactgggttg gggtgggtgg taggttgtag ggctgggttg ggtgaccaca 4679 gggatcttaa taagtcccca gaggtgatgt cctgaaagcc acttctgcca caacaggaag 4739 gtcacaagca taaggacaga agtgtattca gtggctcctg ctacctatgt cctcaagtgc 4799 catgctttg 4808 14 1507 PRT Mus musculus 14 Met Glu Ser Leu Asp Arg Arg Arg Thr Gly Ser Glu Gln Glu Glu Gly 1 5 10 15 Phe Gly Val Gln Ser Arg Arg Ala Thr Asp Leu Gly Met Val Pro Asn 20 25 30 Leu Arg Arg Ser Asn Ser Ser Leu Cys Lys Ser Arg Arg Phe Leu Cys 35 40 45 Ser Phe Ser Ser Glu Lys Gln Glu Asn Leu Ser Ser Trp Ile Pro Glu 50 55 60 Asn Ile Lys Lys Lys Glu Cys Val Tyr Phe Val Glu Ser Ser Lys Leu 65 70 75 80 Ser Asp Ala Gly Lys Val Val Cys Ala Cys Gly Tyr Thr His Glu Gln 85 90 95 His Leu Glu Val Ala Ile Lys Pro His Thr Phe Gln Gly Lys Glu Trp 100 105 110 Asp Pro Lys Lys His Val Gln Glu Met Pro Thr Asp Ala Phe Gly Asp 115 120 125 Ile Val Phe Thr Asp Leu Ser Gln Lys Val Gly Lys Tyr Val Arg Val 130 135 140 Ser Gln Asp Thr Pro Ser Ser Val Ile Tyr Gln Leu Met Thr Gln His 145 150 155 160 Trp Gly Leu Asp Val Pro Asn Leu Leu Ile Ser Val Thr Gly Gly Ala 165 170 175 Lys Asn Phe Asn Met Lys Leu Arg Leu Lys Ser Ile Phe Arg Arg Gly 180 185 190 Leu Val Lys Val Ala Gln Thr Thr Gly Ala Trp Ile Ile Thr Gly Gly 195 200 205 Ser His Thr Gly Val Met Lys Gln Val Gly Glu Ala Val Arg Asp Phe 210 215 220 Ser Leu Ser Ser Ser Cys Lys Glu Gly Glu Val Ile Thr Ile Gly Val 225 230 235 240 Ala Thr Trp Gly Thr Ile His Asn Arg Glu Gly Leu Ile His Pro Met 245 250 255 Gly Gly Phe Pro Ala Glu Tyr Met Leu Asp Glu Glu Gly Gln Gly Asn 260 265 270 Leu Thr Cys Leu Asp Ser Asn His Ser His Phe Ile Leu Val Asp Asp 275 280 285 Gly Thr His Gly Gln Tyr Gly Val Glu Ile Pro Leu Arg Thr Lys Leu 290 295 300 Glu Lys Phe Ile Ser Glu Gln Thr Lys Glu Arg Gly Gly Val Ala Ile 305 310 315 320 Lys Ile Pro Ile Val Cys Val Val Leu Glu Gly Gly Pro Gly Thr Leu 325 330 335 His Thr Ile Tyr Asn Ala Ile Asn Asn Gly Thr Pro Cys Val Ile Val 340 345 350 Glu Gly Ser Gly Arg Val Ala Asp Val Ile Ala Gln Val Ala Thr Leu 355 360 365 Pro Val Ser Glu Ile Thr Ile Ser Leu Ile Gln Gln Lys Leu Ser Ile 370 375 380 Phe Phe Gln Glu Met Phe Glu Thr Phe Thr Glu Asn Gln Ile Val Glu 385 390 395 400 Trp Thr Lys Lys Ile Gln Asp Ile Val Arg Arg Arg Gln Leu Leu Thr 405 410 415 Ile Phe Arg Glu Gly Lys Asp Gly Gln Gln Asp Val Asp Val Ala Ile 420 425 430 Leu Gln Ala Leu Leu Lys Ala Ser Arg Ser Gln Asp His Phe Gly His 435 440 445 Glu Asn Trp Asp His Gln Leu Lys Leu Ala Val Ala Trp Asn Arg Val 450 455 460 Asp Ile Ala Arg Ser Glu Ile Phe Thr Asp Glu Trp Gln Trp Lys Pro 465 470 475 480 Ala Asp Leu His Pro Met Met Thr Ala Ala Leu Ile Ser Asn Lys Pro 485 490 495 Glu Phe Val Arg Leu Phe Leu Glu Asn Gly Val Arg Leu Lys Glu Phe 500 505 510 Val Thr Trp Asp Thr Leu Leu Cys Leu Tyr Glu Asn Leu Glu Pro Ser 515 520 525 Cys Leu Phe His Ser Lys Leu Gln Lys Val Leu Ala Glu Glu Gln Arg 530 535 540 Leu Ala Tyr Ala Ser Ala Thr Pro Arg Leu His Met His His Val Ala 545 550 555 560 Gln Val Leu Arg Glu Leu Leu Gly Asp Ser Thr Gln Leu Leu Tyr Pro 565 570 575 Arg Pro Arg Tyr Thr Asp Arg Pro Arg Leu Ser Met Thr Val Pro His 580 585 590 Ile Lys Leu Asn Val Gln Gly Val Ser Leu Arg Ser Leu Tyr Lys Arg 595 600 605 Ser Thr Gly His Val Thr Phe Thr Ile Asp Pro Val Arg Asp Leu Leu 610 615 620 Ile Trp Ala Val Ile Gln Asn His Arg Glu Leu Ala Gly Ile Ile Trp 625 630 635 640 Ala Gln Ser Gln Asp Cys Thr Ala Ala Ala Leu Ala Cys Ser Lys Ile 645 650 655 Leu Lys Glu Leu Ser Lys Glu Glu Glu Asp Thr Asp Ser Ser Glu Glu 660 665 670 Met Leu Ala Leu Ala Asp Glu Phe Glu His Arg Ala Ile Gly Val Phe 675 680 685 Thr Glu Cys Tyr Arg Lys Asp Glu Glu Arg Ala Gln Lys Leu Leu Val 690 695 700 Arg Val Ser Glu Ala Trp Gly Lys Thr Thr Cys Leu Gln Leu Ala Leu 705 710 715 720 Glu Ala Lys Asp Met Lys Phe Val Ser His Gly Gly Ile Gln Ala Phe 725 730 735 Leu Thr Lys Val Trp Trp Gly Gln Leu Cys Val Asp Asn Gly Leu Trp 740 745 750 Arg Ile Ile Leu Cys Met Leu Ala Phe Pro Leu Leu Phe Thr Gly Phe 755 760 765 Ile Ser Phe Arg Glu Lys Arg Leu Gln Ala Leu Cys Arg Pro Ala Arg 770 775 780 Val Arg Ala Phe Phe Asn Ala Pro Val Val Ile Phe His Met Asn Ile 785 790 795 800 Leu Ser Tyr Phe Ala Phe Leu Cys Leu Phe Ala Tyr Val Leu Met Val 805 810 815 Asp Phe Gln Pro Ser Pro Ser Trp Cys Glu Tyr Leu Ile Tyr Leu Trp 820 825 830 Leu Phe Ser Leu Val Cys Glu Glu Thr Arg Gln Leu Phe Tyr Asp Pro 835 840 845 Asp Gly Cys Gly Leu Met Lys Met Ala Ser Leu Tyr Phe Ser Asp Phe 850 855 860 Trp Asn Lys Leu Asp Val Gly Ala Ile Leu Leu Phe Ile Val Gly Leu 865 870 875 880 Thr Cys Arg Leu Ile Pro Ala Thr Leu Tyr Pro Gly Arg Ile Ile Leu 885 890 895 Ser Leu Asp Phe Ile Met Phe Cys Leu Arg Leu Met His Ile Phe Thr 900 905 910 Ile Ser Lys Thr Leu Gly Pro Lys Ile Ile Ile Val Lys Arg Met Met 915 920 925 Lys Asp Val Phe Phe Phe Leu Phe Leu Leu Ala Val Trp Val Val Ser 930 935 940 Phe Gly Val Ala Lys Gln Ala Ile Leu Ile His Asn Glu Ser Arg Val 945 950 955 960 Asp Trp Ile Phe Arg Gly Val Val Tyr His Ser Tyr Leu Thr Ile Phe 965 970 975 Gly Gln Ile Pro Thr Tyr Ile Asp Gly Val Asn Phe Ser Met Asp Gln 980 985 990 Cys Ser Pro Asn Gly Thr Asp Pro Tyr Lys Pro Lys Cys Pro Glu Ser 995 1000 1005 Asp Trp Thr Gly Gln Ala Pro Ala Phe Pro Glu Trp Leu Thr Val Thr 1010 1015 1020 Leu Leu Cys Leu Tyr Leu Leu Phe Ala Asn Ile Leu Leu Leu Asn Leu 1025 1030 1035 1040 Leu Ile Ala Met Phe Asn Tyr Thr Phe Gln Glu Val Gln Glu His Thr 1045 1050 1055 Asp Gln Ile Trp Lys Phe Gln Arg His Asp Leu Ile Glu Glu Tyr His 1060 1065 1070 Gly Arg Pro Pro Ala Pro Pro Pro Leu Ile Leu Leu Ser His Leu Gln 1075 1080 1085 Leu Leu Ile Lys Arg Ile Val Leu Lys Ile Pro Ala Lys Arg His Lys 1090 1095 1100 Gln Leu Lys Asn Lys Leu Glu Lys Asn Glu Glu Thr Ala Leu Leu Ser 1105 1110 1115 1120 Trp Glu Leu Tyr Leu Lys Glu Asn Tyr Leu Gln Asn Gln Gln Tyr Gln 1125 1130 1135 Gln Lys Gln Arg Pro Glu Gln Lys Ile Gln Asp Ile Ser Glu Lys Val 1140 1145 1150 Asp Thr Met Val Asp Leu Leu Asp Met Asp Gln Val Lys Arg Ser Gly 1155 1160 1165 Ser Thr Glu Gln Arg Leu Ala Ser Leu Glu Glu Gln Val Thr Gln Val 1170 1175 1180 Thr Arg Ala Leu His Trp Ile Val Thr Thr Leu Lys Asp Ser Gly Phe 1185 1190 1195 1200 Gly Ser Gly Ala Gly Ala Leu Thr Leu Ala Pro Gln Arg Ala Phe Asp 1205 1210 1215 Glu Pro Asp Ala Glu Leu Ser Ile Arg Arg Lys Val Glu Glu Pro Gly 1220 1225 1230 Asp Gly Tyr His Val Ser Ala Arg His Leu Leu Tyr Pro Asn Ala Arg 1235 1240 1245 Ile Met Arg Phe Pro Val Pro Asn Glu Lys Val Pro Trp Ala Ala Glu 1250 1255 1260 Phe Leu Ile Tyr Asp Pro Pro Phe Tyr Thr Ala Glu Lys Asp Val Ala 1265 1270 1275 1280 Leu Thr Asp Pro Val Gly Asp Thr Ala Glu Pro Leu Ser Lys Ile Ser 1285 1290 1295 Tyr Asn Val Val Asp Gly Pro Thr Asp Arg Arg Ser Phe His Gly Val 1300 1305 1310 Tyr Val Val Glu Tyr Gly Phe Pro Cys Glu Pro His Gly Pro Arg Gln 1315 1320 1325 Gly Cys Cys Gly Arg Gly Ser Leu Ser Trp Phe Gly Pro Asn His Thr 1330 1335 1340 Leu Gln Pro Val Val Thr Arg Trp Lys Arg Asn Gln Gly Gly Ala Ile 1345 1350 1355 1360 Cys Arg Lys Ser Val Arg Lys Met Leu Glu Val Leu Val Met Lys Leu 1365 1370 1375 Pro Arg Ser Glu His Trp Ala Leu Pro Gly Gly Ser Arg Glu Pro Gly 1380 1385 1390 Glu Met Leu Pro Arg Lys Leu Lys Arg Val Leu Arg Gln Glu Phe Trp 1395 1400 1405 Val Ala Phe Glu Thr Leu Leu Met Gln Gly Thr Glu Val Tyr Lys Gly 1410 1415 1420 Tyr Val Asp Asp Pro Arg Asn Thr Asp Asn Ala Trp Ile Glu Thr Val 1425 1430 1435 1440 Ala Val Ser Ile His Phe Gln Asp Gln Asn Asp Met Glu Leu Lys Arg 1445 1450 1455 Leu Glu Glu Asn Leu His Thr His Asp Pro Lys Glu Leu Thr Arg Asp 1460 1465 1470 Leu Lys Leu Ser Thr Glu Trp Gln Val Val Asp Arg Arg Ile Pro Leu 1475 1480 1485 Tyr Ala Asn His Lys Thr Ile Leu Gln Lys Val Ala Ser Leu Phe Gly 1490 1495 1500 Ala His Phe 1505 15 20 DNA Mus musculus 15 gtctctgtcc tcgggtgaat 20 16 20 DNA Mus musculus 16 caaagcatgg cacttgagga 20 17 18 DNA Mus musculus 17 tctatcccaa tgcccgca 18 18 18 DNA Mus musculus 18 aaactctgcc gcccaagg 18 

1. A method for screening a substance useful for inhibiting cell death, characterized in that it comprises a step of allowing a substance to be tested to contact with a cell expressing a polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2, SEQ ID NO:4 or SEQ ID NO:14 or a variation functionally equivalent thereof, under such a condition that the aforementioned polypeptide or a variation functionally equivalent thereof can be activated, and a step of analyzing inhibition of the activation of the aforementioned polypeptide or a variation functionally equivalent thereof.
 2. A process for producing a pharmaceutical composition for cell death inhibition, characterized in that it comprises a step of carrying out screening using the screening method according to claim 1, and a step of preparing a pharmaceutical preparation using a substance obtained by the aforementioned screening.
 3. (1) A polypeptide which comprises the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14 and also exhibiting the LTRPC2 protein activity, or (2) a polypeptide which comprises an amino acid sequence in which one or several amino acids in the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14 are substituted, deleted and/or inserted and also exhibiting the LTRPC2 protein activity (with the proviso that a polypeptide consisting of the amino acid sequence represented by SEQ ID NO:2 is excluded).
 4. A polypeptide which consists of the amino acid sequence represented by SEQ ID NO:4 or SEQ ID NO:14.
 5. A polynucleotide which encodes the polypeptide according to claim 3 or
 4. 6. A vector which comprises the polynucleotide according to claim
 5. 7. A cell which comprises the vector according to claim
 6. 8. A process for producing the polypeptide according to claim 3 or 4, characterized in that it comprises a step of culturing the cell according to claim
 7. 